Haarala, Atte, Juli-Anna Linjamäki, Heikki Tuominen, and Mika Kähönen. 2017. “High Resolution Manometry and PH Stepup Method on the Localisation of the Lower Esophageal Sphincter”. Journal of Gastrointestinal and Liver Diseases 26 (4), 425-29. https://doi.org/10.15403/jgld.2014.1121.264.haa.