Kotzev Andrey, Chernev Nikolay
Medical university, university hospital "Alexandrovska", clinic of gastroenterology, Sofia, Bulgaria.
Medical University, department of diagnostic imaging, Sofia, Bulgaria.
Presse Med. 2018 Nov-Dec;47(11-12 Pt 1):1013-1015. doi: 10.1016/j.lpm.2018.09.013. Epub 2018 Oct 19.