Effect of ginger in the treatment of nausea and vomiting compared with vitamin B6 and placebo during pregnancy: A meta-analysis - Hu, Y; Amoah, A N; Zhang, H; Fu, R; Qiu, Y; Cao, Y; Sun, Y; Chen, H; Liu, Y; Lyu, Q (J Matern Fetal Neonatal Med, 2022)