68
Participants
Start Date
June 30, 2015
Primary Completion Date
July 31, 2015
Study Completion Date
October 31, 2015
non-smoker oral placebo
Participants oral placebo last 2 weeks.
non-smoker oral melatonin
Participants oral melatonin 3 mg/day last 2 weeks.
smoker oral placebo
Participants oral placebo last 2 weeks.
smoker oral melatonin
Participants oral melatonin 3 mg/day last 2 weeks.
PekingUMCH, Beijing
Peking Union Medical College Hospital
OTHER