Table 1.

Quality assessment of the included randomized controlled studies based on the Jadad scoring system

Ref.	Randomized	Appropriate randomization	Appropriately double blinded	Description of withdrawals	Total Jadad score
Ishikawa et al[20]	Yes	Yes	No	Yes	3
Lee et al[26]	Yes	Yes	No	Yes	3
Imamura et al[27] or Hirao et al[31]	Yes	Yes	No	Yes	3