Table 3.

Quality of included studies (Jadad score).

Author	Randomized	Appropriate randomization	Double blind	Appropriate blinding (single blind)	Drop outs appropriately declared	Score
Jost	Yes	Yes	No	Yes	Yes	4/5
Baker	Yes	Yes	No	Yes	Yes	4/5
Jacobs	Yes	Yes	No	Yes	Yes	4/5
Wik	Yes	Yes	No	Yes	Yes	4/5