RT Journal Article SR Electronic T1 Socioeconomic inequality in birth outcomes: What do the indicators tell us, and where do we find the data? JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1429 OP 1430 DO 10.1503/cmaj.060349 VO 174 IS 10 A1 Anne-Marie Nybo Andersen A1 Laust H. Mortensen YR 2006 UL http://www.cmaj.ca/content/174/10/1429.abstract