Article History
Received: 31 March 2020
Accepted: 23 July 2020
First Online: 5 August 2020
Compliance with ethical standards
:
: LN designed the study, analyzed the manometric data, and conducted the statistical analysis; EMQ contributed to the conception and interpretation of data for the work; and LN drafted the manuscript. EMQ and MOW helped with revising the manuscript critically for important intellectual content. All authors approved the final version of the article.