TY - JOUR T1 - How to use antihistamines JF - Canadian Medical Association Journal JO - CMAJ SP - E478 LP - E479 DO - 10.1503/cmaj.201959 VL - 193 IS - 14 AU - Derek K. Chu AU - Paul Oykhman AU - Gordon L. Sussman Y1 - 2021/04/06 UR - http://www.cmaj.ca/content/193/14/E478.abstract ER -