RT Journal Article SR Electronic T1 Seasonal variation in birth weight JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 733 OP 733-a DO 10.1503/cmaj.1050100 VO 173 IS 7 A1 John J. McGrath A1 Thomas H. Burne A1 Darryl W. Eyles YR 2005 UL http://www.cmaj.ca/content/173/7/733.2.abstract