Vackova Z, Mares J, Krajciova J, Rabekova Z, Zdrhova L, Loudova P, Spicak J, Stirand P, Hucl T, Martinek J.  Esophageal Motility Patterns After Peroral Endoscopic Myotomy in Patients With Achalasia.  J Neurogastroenterol Motil 2021;27:205-214.  https://doi.org/10.5056/jnm20126