Are guidelines followed in Helicobacter pylori diagnosis and therapy? An inquiry among gastroenterologists, referring physicians and patients in Munich - Fritz, N; Birkner, B; Schusdziarra, V; Borlinghaus, K -P; Burlefinger, R; Dettmer, A; Heldwein, W; Henke, M; Höchter, W; Janetschek, P; Kunze, R; Schatke, W; Strauch, M; Struppler, C; Weingart, J; Rösch, T (Zeitschrift für Gastroenterologie, 2000)