RT Journal Article SR Electronic T1 Smartphones, social media use and youth mental health JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E136 OP E141 DO 10.1503/cmaj.190434 VO 192 IS 6 A1 Elia Abi-Jaoude A1 Karline Treurnicht Naylor A1 Antonio Pignatiello YR 2020 UL http://www.cmaj.ca/content/192/6/E136.abstract AB