Table 1.

Quality Assessment of Included Studies

Authors	Quality of Random Allocation Concealment	Sample Size Large Enough to Detect Difference	Intention to Treat	Blinding Patients/ Personnel	Blinding Outcome Assessment	Comparability of Groups	Clear Definition of Inclusion Exclusion Criteria	Description of Withdrawal and Dropout
Barengolts et al. 2015	√	—	√	√	√	√	√	√
Davidson et al. 2013	√	√	√	√	√	√	√	√
Oosterwerff et al. 2014	√	√	√	√	√	√	√	√
Mitri et al. 2011	√	U	√	√	√	√	√	√
Harris et al. 2012	√	√	U	U	U	√	√	√
Tuomainen et al. 2015	√	√	—	√	√	√	√	√
Sollid et al. 2014	√	√	√	√	√	√	√	√
Dutta et al. 2014	√	U	U	—	—	√	√	√
Forouhi et al. 2016	√	√	√	√	√	√	√	√
Jorde et al. 2016	√	√	√	U	U	√	√	√
Moreira-Lucas et al. 2016	√	—	√	√	√	√	√	√
Salehpour et al. 2013	√	U	U	√	√	√	√	√
Pittas et al. 2007	√	U	U	√	√	√	√	√
Ramly et al. 2014	√	√	√	√	√	√	√	√
Carrillo et al. 2013	√	√	U	√	√	√	√	—
Wamberg et al. 2013	√	√	√	√	√	√	√	√
Zittermann et al. 2009	√	U	U	√	√	√	√	√
Gepner et al. 2012	√	√	U	√	√	√	√	√
Grimnes et al. 2011	√	√	√	√	√	√	√	√
Wood et al. 2012	√	√	√	√	√	√	√	√
Asemi et al. 2015	√	√	√	√	√	√	√	√
Sun et al. 2016	√	√	U	√	√	√	√	√
Sharifi et al. 2014	√	√	U	√	√	√	√	√
Mousa et al. 2017	√	√	—	√	√	√	√	√
Osati et al. 2016	√	U	U	√	√	√	√	√
Grubler et al. 2016	√	√	√	√	√	√	√	√
Lorvand Amiri et al. 2016	√	√	U	√	√	√	√	√
Vahedpoor et al. 2017	√	√	√	√	√	√	√	√

Abbreviations: √, adequate; —, inadequate; U, unclear.