TY - JOUR T1 - Gravity JF - Canadian Family Physician JO - Can Fam Physician SP - 518 LP - 518 VL - 66 IS - 7 AU - Yelena Zavalishina Y1 - 2020/07/01 UR - http://www.cfp.ca/content/66/7/518.abstract N2 - ER -