Table 4.

Modified Jadad Score for clinical trials.

Study	Randomization	Concealment of allocation	Double blinding	Total Withdrawals and dropouts	Total
Wang CJ	**		**	*	5
Chen CH	**	**	**	*	7
Nishii T	*	*	*	*	4
Lai KA	**		**	*	5
Lee YK	**	**	**	*	7
Kang P	**	*	**	*	6
Gao Y	**		**	*	5

Each asterisk represents one point. Modified Jadad score is used to evaluate the quality of articles and studies achieving a score of ≥4 points were considered to be of high quality.