Incidence of ulcers (A), erosions (B), dyspeptic complaints requiring therapy (C), and combined outcome criteria (D) consisting of ulcer or >10 erosions or dyspepsia requiring therapy in the intention to treat population (last value during diclofenac treatment). OAC-P, omeprazole+amoxicillin+clarithromycin, followed by placebo; OAC-O, omeprazole+amoxicillin+clarithromycin, followed by omeprazole; O-O, omeprazole followed by omeprazole; P-P, placebo followed by placebo.