RT Journal Article SR Electronic T1 GPs challenge seven-day NHS proposal JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E9 OP E9 DO 10.1503/cmaj.109-5195 VO 188 IS 1 A1 Debra Martens YR 2016 UL http://www.cmaj.ca/content/188/1/E9.abstract