RT Journal Article SR Electronic T1 Retained intrauterine devices in pregnancy JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E440 OP E440 DO 10.1503/cmaj.171059 VO 190 IS 14 A1 Ari P. Sanders A1 Barry H. Sanders YR 2018 UL http://www.cmaj.ca/content/190/14/E440.abstract AB