Search strategy
MEDLINE was searched from January 1972 until March 2020 using keywords ”proning positioning” or “proning position” and “pregnancy”. The result did not yield any case series of proning for ARDS in pregnancy. It is possible that manuscripts on ARDS that focused on other interventions had proning as part of the protocol. An example is a case series of extracorporeal membrane oxygenation (ECMO) in pregnancy and postpartum(11). However, we could not identify any case series whose objective was discussion or proning in pregnancy.