Table 5. Quality indicators for cohort studies.

First author	Year (Ref. No)	Same mode of inclusion for intervention and control group	Enough F/U duration	Report of loss of F/U	Adjusted analysis for confounding variables	Mode of participants selection described	Potential important baseline differences	Sample size prespecified	Report of important baseline characteristics modification during F/U
Jacobsen R	2000 (13)	Yes	Yes	No	Yes	Yes	No	Yes	No
Raman JD	2005 (14)	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes