Ofosu A, Mohan BP, Ichkhanian Y, Masadeh M, Febin J, Barakat M, Ramai D, Chandan S, Haiyeva G, Khan SR, Aghaie Meybodi M, Facciorusso A, Repici A, Wani S, Thosani N, Khashab MA. Peroral endoscopic myotomy (POEM) vs pneumatic dilation (PD) in treatment of achalasia: A meta-analysis of studies with = 12-month follow-up. Endosc Int Open. 2021 Jul; 9(7):E1097-E1107.