[1] Carl von Ossietzky Univ Oldenburg, Pius Hosp Oldenburg, Univ Hosp Visceral Surg, Georgstr 12, D-26121 Oldenburg, Germany
[2] Medicover Oldenburg MVZ, Elisenstr 12, D-26122 Oldenburg, Germany
[3] Univ Wurzburg, Univ Hosp, Div Endocrinol & Diabet, Dept Internal Med 1, Josef Schneider Str 2, D-97080 Wurzburg, Germany
[4] Carl Von Ossietzky Univ Oldenburg, Pius Hosp Oldenburg, Div Nucl Med, Georgstr 12, D-26121 Oldenburg, Germany