Funding for this research was provided by:
United European Gastroenterology (Activity Grant)
Received: 7 January 2019
Accepted: 29 May 2019
First Online: 8 June 2019
Availability of data and materials
: All data generated or analysed during this study are included in this published article and its Additional files.
: The study protocol conforms to the ethical guidelines of the 1975 Declaration of Helsinki as reflected in a priori approval by the Ethical Committee of the National Center for AIDS Prevention on 11 December, 2017.
: Not applicable.
: The authors declare that they have no competing interests.