| First author (year) | Study design | ITTA | Duration (month) | Jadad points | Country |
| RodrÃguez (1997) [17] | Randomized, double-blind, placebo | Yes | 6 | 6 | Chile | Modena (2001) [18] | Randomized, placebo | Yes | 12 | 5 | Italy | Pitt (2003) [11] | Randomized, double-blind, placebo | Yes | 16 | 7 | Multiple | Hayashi (2003) [19] | Randomized, nonplacebo | No | 1 | 6 | Japan | Di Pasquale (2001) [20] | Randomized, double-blind, placebo | No | 6 | 5 | Italy | Di Pasquale (2005) [21] | Randomized, double-blind, placebo | No | 6 | 5 | Italy | Uzunhasan (2009) [22] | Randomized, double-blind, placebo | Yes | 6 | 7 | Turkey | Kayrak (2010) [23] | Randomized, nonplacebo | No | 6 | 5 | Turkey | Weir (2011) [24] | Randomized, double-blind, placebo | No | 5.5 | 7 | UK | Kampourides (2012) [25] | Randomized, open-labeled, nonplacebo | No | 24 | 6 | Greece | Wu (2013) [26] | Randomized, placebo | No | 12 | 6 | China | Vatankulu (2013) [27] | Randomized, nonplacebo | Yes | 6 | 5 | Turkey | Montalescot (2014) [28] | Randomized, double-blind, placebo | Yes | 10.5 | 7 | Multiple | Beygui (2016) [12] | Randomized, open-labeled, blinded endpoint, nonplacebo | Yes | 6 | 5 | Multiple | Bulluck (2019) [13] | Randomized, double-blinded, placebo | Yes | 3 | 7 | UK |
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