PT - JOURNAL ARTICLE AU - Zhang, Grace TI - Alternate timelines AID - 10.1503/cmaj.200124 DP - 2020 Jul 27 TA - Canadian Medical Association Journal PG - E866--E867 VI - 192 IP - 30 4099 - http://www.cmaj.ca/content/192/30/E866.short 4100 - http://www.cmaj.ca/content/192/30/E866.full SO - CMAJ2020 Jul 27; 192