RT Journal Article SR Electronic T1 Melatonin JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP cmaj.111765 DO 10.1503/cmaj.111765 A1 Michael D. Carter A1 David N. Juurlink YR 2012 UL http://www.cmaj.ca/content/early/2012/04/16/cmaj.111765.abstract AB