Table 3.

Risk of bias in the included studies according to the modified Consolidated Standards of Reporting Trials (CONSORT) checklist. Each item is marked as reported (*) or not (empty box) according to the description of each study.

Ref.	1	2a	2b	3	4	5	6	7	8	9	10	11	12	13	14
Almazdi et al. [21]	*	*	*	*	*						*	*	*
Kim and Kim [42]	*	*	*	*	*						*	*	*	*
Jerman et al. [13]	*	*	*	*	*						*	*	*	*
Presenda et al. [60]	*	*	*	*	*									*
Pekkan [84]	*	*	*	*	*						*	*	*	*
Presenda et al. [56]	*	*	*	*	*							*		*
Yılmaz Savaş and Akın [53]	*	*	*	*	*	*	*	*			*	*	*
Kim et al. [58]	*	*	*	*	*						*	*	*	*
Marinis et al. [39]	*	*	*	*	*	*					*	*		*
Presenda et al. [59]	*	*	*	*	*							*		*
Presenda et al. [99]	*	*	*	*	*							*		*
Jansen et al. [41]	*	*	*	*	*						*	*	*	*
Al-Zordk and Saker [85]	*	*	*	*	*						*	*	*
Liu et al. [36]	*	*	*	*	*	*					*	*	*	*
Yang et al. [86]	*	*	*	*	*						*			*
Cokic et al. [22]	*	*	*	*	*						*	*		*
Ai et al. [61]	*	*	*	*	*									*
Borrell et al. [34]	*	*	*	*	*									*
Luz et al. [18]	*	*		*	*						*	*		*
Liu et al. [87]	*	*	*	*	*						*		*	*
Li et al. [54]	*	*	*	*	*						*	*
Lawson and Maharishi [16]	*	*	*	*	*						*	*	*	*
Moratal et al. [19]	*	*	*	*	*									*
Jiang et al. [52]	*	*	*	*	*						*	*
Han et al. [55]	*	*	*	*	*						*	*		*
Ribeiro et al. [57]	*	*	*	*	*							*		*