{{Cite journal| doi = 10.1111/apt.15608| issn = 1365-2036 (Electronic) 0269-2813 (Linking)| volume = 51| issue = 2| pages = 313–314| last1 = Papaefthymiou| first1 = A.| last2 = Doulberis| first2 = M.| last3 = Polyzos| first3 = S. A.| last4 = Katsinelos| first4 = P.| last5 = Liatsos| first5 = C.| last6 = Koffas| first6 = A.| last7 = Kazakos| first7 = E.| last8 = Deretzi| first8 = G.| last9 = Srivastava| first9 = D. S.| last10 = Kountouras| first10 = J.| title = Letter: Helicobacter pylori in proton pump inhibitor-associated biliary disease| journal = Aliment Pharmacol Ther| date = 2019-12-28| pmid = 31880012}}