“…Two studies used prospective cohort designs (Roberts et al, 2017;Veiga et al, 2011). Half of the trials recruited women undergoing surgical abortion (Chor et al, 2015;Guerrero et al, 2012;Veiga et al, 2011;Wilson et al, 2017;Wu et al, 2012), while other trials either included women having a medical abortion (Constant et al, 2014;Gerdts et al, 2020) or did not limit inclusion on type of abortion (Roberts et al, 2017;Sonalkar et al, 2017;Yu et al, 2010). Most studies presented adequate information regarding the research background, participants' eligibility criteria, randomization, baseline data, and statistical analysis.…”