| 54 | Austria, Salzburg, Paracelsus Medical University | (Killer-Oberpfalzer et al., 2012) | 17 | 12 |
| 103 | Canada, Ontario, London, University of Western Ontario | (Scott et al., 1972) | 7 | 6 |
| 16 | Canada, Ontario, London, University of Western Ontario | (Canham et al., 1996) | 5 | 11 |
| 15 | Canada, Ontario, London, University of Western Ontario | (Canham et al., 1999) | 7 | 6 |
| 73 | Canada, Ontario, London, University of Western Ontario | (MacDonald et al., 2000) | 4 | 13 |
| 67 | China, Beijing, Beijing Tiantan Hospital, Capital Medical University | (Li et al., 2007) | 6 | 9 |
| 68 | China, Beijing, Beijing Tiantan Hospital, Capital Medical University | (Li et al., 2009) | 3 | 7 |
| 47 | China, Beijing, Beijing Tiantan Hospital, Capital Medical University | (Jia et al., 2011) | 9 | 12 |
| 119 | China, Beijing, Beijing Tiantan Hospital, Capital Medical University | (Yu et al., 2014) | 15 | 12 |
| 91 | China, Beijing, Beijing Tiantan Hospital, Capital Medical University | (Peng et al., 2016) | 31 | 13 |
| 117 | China, Beijing, Beijing Tiantan Hospital, Capital Medical University | (Wang et al., 2017) | 27 | 11 |
| 66 | China, Beijing, Beijing Tiantan Hospital, Capital Medical University | (Li et al., 2017a) | 12 | 15 |
| 120 | China, Beijing, Beijing Tiantan Hospital, Capital Medical University | (Yu et al., 2017) | 20 | 15 |
| 48 | China, Beijing, Beijing Tiantan Hospital, Capital Medical University | (Jiang et al., 2018) | 12 | 16 |
| 19 | China, Beijing, Xuanwu Capital University | (Cheng and Wang, 2013) | 30 | 12 |
| 123 | China, Changsha, The Second Xiangya Hospital of Central South University | (Zhang et al., 2015b) | 70 | 12 |
| 26 | China, Chengdu, Chengdu Military General Hospital | (Fan et al., 2016) | 10 | 4 |
| 50 | China, Dalian, ZhongShan Affiliated Hospital of Dalian University | (Jin et al., 2007) | 30 | 7 |
| 49 | China, Hunan, Changsha, The Third Xiangya Hospital of Central South University | (Jiang et al., 2013) | 14 | 10 |
| 27 | China, Hunan, Changsha, The Third Xiangya Hospital of Central South University | (Fan et al., 2015) | 40 | 12 |
| 122 | China, Jiangsu, Nanjing, Jinling Hospital, School of Medicine, Nanjing University | (Zhang et al., 2015a) | 36 | 16 |
| 121 | China, Jiangsu, Nanjing, Jinling Hospital, School of Medicine, Nanjing University | (Zhang et al., 2016) | 41 | 15 |
| 70 | China, Jilin, Changchun, China-Japan Union Hospital of Jilin University | (Liu et al., 2014) | 6 | 10 |
| 8 | China, Jilin, Changchun, China-Japan Union Hospital of Jilin University | (Bo et al., 2018) | 3 | 5 |
| 65 | China, Jinan, Qilu Hospital, Shandong University | (Li et al., 2013) | 31 | 14 |
| 115 | China, Shandong, Weifang, Weifang Peoples Hospital | (Wang et al., 2015a) | 14 | 14 |
| 116 | China, Shandong, Weifang, Weifang Peoples Hospital | (Wang et al., 2015b) | 48 | 9 |
| 72 | China, Shanghai, Huashan Hospital of Fudan University | (Liu et al., 2018) | 10 | 14 |
| 71 | China, Shanghai, Huashan Hospital of Fudan University | (Liu et al., 2019) | 5 | 7 |
| 18 | China, Shanghai, Renji Hospital, Scholl of Medicine, Shanghai Jiao Tong University | (Chen et al., 2013) | 19 | 11 |
| 108 | China, Shanghai, Ruijin Hospital, Shanghai Jia Tong University School of Medicine | (Song et al., 2018) | 10 | 10 |
| 69 | China, Sichuan, Sichuan Academy of Medical Sciences & Sichuan Provincial Peoples Hospital | (Li et al., 2017b) | 9 | 12 |
| 35 | China, Zhengzhou, The First Affiliated Hospital of Zhengzhou University | (Guo et al., 2007) | 15 | 12 |
| 84 | Finland, Helsinki, Helsinki University Central Hospital | (Nystrom, 1970) | 85 | 14 |
| 85 | Finland, Helsinki, Helsinki University Central Hospital | (Nystrom, 1972) | 94 | 14 |
| 29 | Finland, Helsinki, Helsinki University Central Hospital | (Frosen et al., 2004) | 66 | 19 |
| 113 | Finland, Helsinki, Helsinki University Central Hospital | (Tulamo et al., 2006) | 58 | 15 |
| 30 | Finland, Helsinki, Helsinki University Central Hospital | (Frosen et al., 2006) | 56 | 16 |
| 63 | Finland, Helsinki, Helsinki University Central Hospital | (Laaksamo et al., 2008) | 24 | 14 |
| 112 | Finland, Helsinki, Helsinki University Central Hospital | (Tulamo et al., 2010a) | 100 | 15 |
| 114 | Finland, Helsinki, Helsinki University Central Hospital | (Tulamo et al., 2010b) | 52 | 13 |
| 11 | Finland, Helsinki, Helsinki University Central Hospital | (Bygglin et al., 2011) | 29 | 5 |
| 61 | Finland, Helsinki, Helsinki University Central Hospital | (Kurki et al., 2011) | 19 | 12 |
| 62 | Finland, Helsinki, Helsinki University Central Hospital | (Laaksamo et al., 2012) | 26 | 12 |
| 31 | Finland, Helsinki, Helsinki University Central Hospital | (Frosen et al., 2013) | 54 | 14 |
| 64 | Finland, Helsinki, Helsinki University Central Hospital | (Laaksamo et al., 2013) | 66 | 15 |
| 87 | Finland, Helsinki, Helsinki University Central Hospital | (Ollikainen et al., 2014) | 36 | 14 |
| 45 | Finland, Helsinki, Helsinki University Central Hospital | (Honkanen et al., 2014) | 3 | 13 |
| 90 | Finland, Helsinki, Helsinki University Central Hospital | (Ollikainen et al., 2016) | 36 | 14 |
| 88 | Finland, Helsinki, Helsinki University Central Hospital | (Ollikainen et al., 2018a) | 36 | 14 |
| 89 | Finland, Helsinki, Helsinki University Central Hospital | (Ollikainen et al., 2018b) | 36 | 14 |
| 118 | Finland, Kuopio, University Kuopio | (Weinsheimer et al., 2007) | 12 | 10 |
| 17 | Finland, Kuopio, University Kuopio | (Cebral et al., 2017) | 20 | 13 |
| 94 | Finland, Tampere, Tampere University Hospital | (Pyysalo et al., 2013) | 36 | 13 |
| 93 | Finland, Tampere, Tampere University Hospital | (Pyysalo et al., 2016) | 70 | 17 |
| 9 | France, Montpellier + Marseille | (Brunel et al., 2018) | 39 | 12 |
| 25 | Germany, Düsseldorf, Heinrich-Heine-University | (Etminan et al., 2013) | 9 | 16 |
| 102 | Germany, Frankfurt, Johann Goethe-University | (Schlote and Gaus, 1994) | 76 | 12 |
| 44 | Germany, Osnabrück, Paracelsus-Klinik | (Holling et al., 2009) | 91 | 16 |
| 57 | Hungary, Debrecen, University of Debrecen Medical and Health Science Center | (Klekner et al., 2005) | 11 | 13 |
| 77 | Hungary, Pecs, University of Pecs Medical School | (Merei and Gallyas, 1980) | 60 | 11 |
| 6 | India, Karnataka, Bengaluru, National Institute of Mental Health and Neurosciences | (Babu et al., 2016) | 23 | 17 |
| 95 | India, Trivandrum, Sree Chitra Tirunal Institute for Medical Sciences and Technology | (Rajesh et al., 2004) | 57 | 12 |
| 13 | Ireland, Dublin, Royal College of Surgeons in Ireland | (Caird et al., 2003) | 25 | 12 |
| 14 | Ireland, Dublin, Royal College of Surgeons in Ireland | (Caird et al., 2006) | 11 | 11 |
| 106 | Italy, Bari, University Aldo Moro of Bari | (Signorelli et al., 2018) | 16 | 16 |
| 76 | Italy, Chieti-Pescara, University G. dAnnunzio | (Marchisio et al., 2004) | 23 | 13 |
| 74 | Italy, Milan, Fondazione IRCCS Istituto Neurologico C. Besta | (Maderna et al., 2010) | 6 | 10 |
| 99 | Italy, Padua, University of Padua | (Scanarini et al., 1978a) | 10 | 11 |
| 100 | Italy, Padua, University of Padua | (Scanarini et al., 1978b) | 4 | 8 |
| 32 | Italy, Pavia & Milan (Rozzano) | (Gaetani et al., 1996) | 6 | 8 |
| 33 | Italy, Pavia, IRCCS Policlinico S. Matteo | (Gaetani et al., 1997) | 15 | 10 |
| 75 | Italy, Roma, Catholic University | (Marchese et al., 2010) | 27 | 14 |
| 36 | Japan, Gifu, Gifu University School of Medicine | (Hara et al., 1998) | 4 | 10 |
| 24 | Japan, Hirosaki, Hirosaki University School of Medicine | (Ebina et al., 1982) | 17 | 8 |
| 105 | Japan, Hiroshima University | (Shimonaga et al., 2018) | 9 | 9 |
| 78 | Japan, Kumamoto, Honjou, Kumamoto University, School of Medicine | (Mimata et al., 1997) | 15 | 14 |
| 86 | Japan, Kuroishi, Kuroishi Municipal Hospital | (Ohkuma et al., 2003) | 33 | 13 |
| 3 | Japan, Kyoto, Kyoto University, Graduate School of Medicine | (Aoki et al., 2010) | 6 | 7 |
| 4 | Japan, Kyoto, Kyoto University, Graduate School of Medicine | (Aoki et al., 2011) | 5 | 7 |
| 79 | Japan, Kyoto, Kyoto University, Graduate School of Medicine | (Miyata et al., 2017) | 5 | 7 |
| 111 | Japan, Kyoto, Kyoto University, Graduate School of Medicine | (Tsuji et al., 2017) | 26 | 13 |
| 110 | Japan, Osaka, Kitano Hospital, Medical Research Institute | (Takagi et al., 2002) | 12 | 12 |
| 98 | Japan, Osaka, Osaka University School of Medicine | (Sakaki et al., 1997) | 27 | 13 |
| 52 | Japan, Osaka-Sayama, Kinik University School of Medicine | (Kataoka et al., 1999) | 71 | 12 |
| 109 | Japan, Sendai, Tohoku University School of Medicine | (Suzuki and Ohara, 1978) | 45 | 14 |
| 81 | Japan, Tokushima, University of Tokushima Graduate School | (Nakajima et al., 2000) | 32 | 12 |
| 82 | Japan, Tokushima, University of Tokushima Graduate School | (Nakajima et al., 2012) | 27 | 14 |
| 2 | Japan, Tokyo, Institute of Medical Science, University of Tokyo | (Akagawa et al., 2007) | 4 | 10 |
| 83 | Japan, Tokyo, Tokyo Metropolitan Fuchu Hospital and Tokyo Womens University | (Nakaoka et al., 2014) | 13 | 14 |
| 60 | Japan, Tokyo, Tokyo Womens Medical University | (Krischek et al., 2008) | 10 | 15 |
| 28 | Netherlands, Utrecht, University Medical Center Utrecht | (Farlow et al., 2015) | 44 | 10 |
| 56 | Netherlands, Utrecht, University Medical Center Utrecht | (Kleinloog et al., 2016) | 44 | 16 |
| 58 | Netherlands, Utrecht, University Medical Center Utrecht | (Korkmaz et al., 2017) | 12 | 12 |
| 92 | Poland, Krakow, Jagiellonian University | (Pera et al., 2010) | 14 | 15 |
| 97 | Poland, Warsaw, Polish Academy of Sciences | (Ryba et al., 1992) | 6 | 9 |
| 101 | Serbia, Belgrade, Clinical Center of Serbia, University of Belgrade | (Scepanovic et al., 2018) | 29 | 14 |
| 21 | Switzerland, Geneva, University of Geneva | (Coen et al., 2013) | 26 | 12 |
| 80 | Switzerland, Geneva, University of Geneva | (Morel et al., 2018) | 47 | 15 |
| 53 | Turkey, Istanbul, Marmara University | (Kilic et al., 2005) | 20 | 14 |
| 46 | Turkey, Istanbul, Marmara University | (Jayaraman et al., 2005) | 10 | 12 |
| 12 | Turkey, Izmir, Ege Üniversitesi Tip Fakültesi | (Cagli et al., 2003) | 15 | 12 |
| 23 | UK, London, Atkinson Morleys Hospital | (Crompton, 1966) | 404 | 12 |
| 22 | USA, CA, San Francisco, University of California San Francisco | (Cooke et al., 2018) | 10 | 16 |
| 5 | USA, Coroners offices in Los Angeles, Orange, and San Diego counties | (Austin et al., 1993) | 18 | 8 |
| 42 | USA, FL, Gainesville, University of Florida | (Hoh et al., 2014) | 36 | 13 |
| 43 | USA, FL, Gainesville, University of Florida | (Hoh et al., 2018) | 5 | 12 |
| 1 | USA, GA, Atlanta, Emory University School of Medicine | (Abruzzo et al., 1998) | 5 | 9 |
| 37 | USA, IA, Iowa City, Carver College of Medicine, University of Iowa | (Hasan et al., 2012a) | 11 | 17 |
| 41 | USA, IA, Iowa City, Carver College of Medicine, University of Iowa | (Hasan et al., 2012d) | 19 | 5 |
| 38 | USA, IA, Iowa City, Carver College of Medicine, University of Iowa | (Hasan et al., 2012b) | 10 | 15 |
| 39 | USA, IA, Iowa City, Carver College of Medicine, University of Iowa | (Hasan et al., 2012c) | 10 | 15 |
| 40 | USA, IA, Iowa City, Carver College of Medicine, University of Iowa | (Hasan et al., 2013) | 11 | 15 |
| 104 | USA; IL, Chicago, Northwestern University | (Shi et al., 2009) | 6 | 14 |
| 34 | USA, MA, Worcester, University of Massachusetts | (Gounis et al., 2014) | 23 | 18 |
| 107 | USA; NH, Connecticut, Yale University School of Medicine | (Skirgaudas et al., 1996) | 10 | 11 |
| 7 | USA, NH, Lebanon, Dartmouth-Hitchcock Medical Center | (Bekelis et al., 2016) | 7 | 14 |
| 59 | USA, NY, Bronx, Albert-Einstein College of Medicine | (Kosierkiewicz et al., 1994) | 31 | 8 |
| 55 | USA, NY, New York, Columbia University, College of Physicians and Surgeons | (Kim et al., 1997) | 6 | 12 |
| 10 | USA, OH, Cleveland, The Cleveland Clinic Foundation | (Bruno et al., 1998) | 23 | 13 |
| 20 | USA; OH, Cleveland, The Cleveland Clinic Foundation | (Chyatte et al., 1999) | 25 | 14 |
| 51 | USA, PA, Pittsburgh, University of Pittsburgh | (Kassam et al., 2004) | 24 | 16 |
| 96 | USA, PA, Pittsburgh, University of Pittsburgh | (Robertson et al., 2015) | 15 | 13 |