RT Journal Article SR Electronic T1 Tighter gun control laws are unlikely to prevent shootings JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E947 OP E947 DO 10.1503/cmaj.72613 VO 191 IS 34 A1 Martin N. Scanlon YR 2019 UL http://www.cmaj.ca/content/191/34/E947.abstract