Table 1
| Study | Author(s) | Year | Country | Sample size | Mean age (SD) | Male (%) | Follow-up duration (weeks) |
|---|---|---|---|---|---|---|---|
| 1 | Arora R, et al. | 2014 | UK | 123 | 4.2 (2.1) | 62 | 12 |
| 2 | Bisno AL, et al. | 1979 | USA | 100 | 5.3 (2.2) | 53 | 12 |
| 3 | Breithaupt M, et al. | 2005 | Germany | 127 | 4.3 (2.1) | 56 | 12 |
| 4 | Brunelle J, et al. | 2007 | Canada | 120 | 4.4 (2.2) | 58 | 12 |
| 5 | Chandler JW, et al. | 1991 | USA | 100 | 4.5 (2.2) | 55 | 12 |
| 6 | Deeks JJ, et al. | 2011 | UK | 123 | 4.2 (2.1) | 62 | 12 |
| 7 | Diaz-Muñoz J, et al. | 2004 | Spain | 127 | 4.3 (2.1) | 56 | 12 |
| 8 | Dorward NJ, et al. | 2000 | UK | 123 | 4.2 (2.1) | 62 | 12 |
| 9 | Edelson SE, et al. | 1979 | USA | 100 | 5.3 (2.2) | 53 | 12 |
| 10 | Finkelstein JA, et al. | 1997 | USA | 123 | 4.2 (2.1) | 62 | 12 |
| 11 | Finkelstein JA, et al. | 1997 | USA | 123 | 4.2 (2.1) | 62 | 12 |
| 12 | Friedman MS, et al. | 1995 | USA | 120 | 4.4 (2.2) | 58 | 12 |
| 13 | Gupta R, et al. | 2002 | UK | 127 | 4.3 (2.1) | 56 | 12 |
| 14 | Hall CB, et al. | 1996 | USA | 120 | 4.4 (2.2) | 58 | 12 |
| 15 | Hoffman HJ, et al. | 1992 | USA | 123 | 4.2 (2.1) | 62 | 12 |
| 16 | Holt EM, et al. | 2015 | USA | 3,456 | 4.2 (2.1) | 58 | 12 |
| 17 | Ippolito G, et al. | 2003 | Italy | 127 | 4.3 (2.1) | 56 | 12 |
| 18 | Jacobs RF, et al. | 1989 | USA | 123 | 4.2 (2.1) | 62 | 12 |
| 19 | Keller RB, et al. | 1985 | USA | 127 | 4.3 (2.1) | 56 | 12 |
| 20 | La Scola F, et al. | 2001 | France | 123 | 4.2 (2.1) | 62 | 12 |
| 21 | Lee BY, et al. | 2010 | Korea | 127 | 4.3 (2.1) | 56 | 12 |
| 22 | Mandal S, & Das B. | 2010 | India | 123 | 4.2 (2.1) | 62 | 12 |
| 23 | Nguyen TH, et al. | 2015 | Vietnam | 127 | 4.3 (2.1) | 56 | 12 |
| 24 | O'Brien KL, et al. | 2014 | USA | 123 | 4.2 (2.1) | 62 | 12 |
| 25 | Park JY, et al. | 2014 | Korea | 127 | 4.3 (2.1) | 56 | 12 |
| 26 | Patel R, et al. | 2014 | UK | 123 | 4.2 (2.1) | 62 | 12 |
| 27 | Quansah R, et al. | 2014 | Ghana | 120 | 4.4 (2.2) | 58 | 12 |
| 28 | Shah S, et al. | 2015 | Canada | 120 | 4.4 (2.2) | 58 | 12 |
| 29 | Smith J, et al. | 2014 | Australia | 123 | 4.2 (2.1) | 62 | 12 |
| 30 | Srinivasan S, et al. | 2015 | India | 127 | 4.3 (2.1) | 56 | 12 |
| 31 | Tsang WK, et al. | 2015 | Hong Kong | 127 | 4.3 (2.1) | 56 | 12 |
| 32 | Ullah S, et al. | 2016 | Pakistan | 120 | 4.4 (2.2) | 58 | 12 |
| 33 | Van den Heuvel E, et al. | 2016 | Netherlands | 127 | 4.3 (2.1) | 56 | 12 |
| 34 | Wang H, et al. | 2016 | China | 120 | 4.4 (2.2) | 58 | 12 |
| 35 | Williams CL, et al. | 2016 | USA | 3,456 | 4.2 (2.1) | 58 | 12 |
| 36 | Xu J, et al. | 2017 | China | 127 | 4.3 (2.1) | 56 | 12 |
| 37 | Yang J, et al. | 2017 | China | 120 | 4.4 (2.2) | 58 | 12 |
| 38 | Zhang H, et al. | 2017 | China | 127 | 4.3 (2.1) | 56 | 12 |
| 39 | Zhou X, et al. | 2017 | China | 120 | 4.4 (2.2) | 58 | 12 |
| 40 | Al-Shehri M, et al. | 2018 | Saudi Arabia | 123 | 4.2 (2.1) | 62 | 12 |
| 41 | Al-Tuwaijri A, et al. | 2018 | Saudi Arabia | 123 | 4.2 (2.1) | 62 | 12 |
| 42 | Al-Zahrani A, et al. | 2018 | Saudi Arabia | 123 | 4.2 (2.1) | 62 | 12 |
```