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Study Characteristics.
| Characteristic | Total (%) (N = 48) |
|---|---|
| Year of publication | |
| 1985-1989 | 1 (2.1) |
| 1990-1994 | 4 (8.3) |
| 1995-1999 | 4 (8.3) |
| 2000-2004 | 8 (16.7) |
| 2005-2009 | 9 (18.8) |
| 2010-2014 | 19 (39.6) |
| 2015-2017 | 3 (6.3) |
| Study location | |
| Asia | 21 (43.8) |
| North America | 12 (25) |
| Europe | 13 (27.1) |
| Australia | 2 (4.2) |
| South America | 0 (0.0) |
| Africa | 0 (0.0) |
