RT Journal Article SR Electronic T1 Challenges presented by a custodian-based medical record access system JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E843 OP E843 DO 10.1503/cmaj.72281 VO 191 IS 30 A1 Shaun D. Mehta YR 2019 UL http://www.cmaj.ca/content/191/30/E843.abstract