Long-term omeprazole treatment in resistant gastroesophageal reflux disease: Efficacy, safety, and influence on gastric mucosaElly C. Klinkenberg–Knol, A. Walan, Frits Nelis et al.|Gastroenterology|2000Cited by 544
Effect of Omeprazole and Ranitidine on Ulcer Healing and Relapse Rates in Patients with Benign Gastric UlcerA. Walan, C B Lamers, D. W. Piper et al.|New England Journal of Medicine|1989Cited by 382
Cure of <i>Helicobacter pylori</i> infection in patients with reflux oesophagitis treated with long term omeprazole reverses gastritis without exacerbation of reflux disease: results of a randomised controlled trialErnst J. Kuipers, A. Walan, G.F. Nelis et al.|Gut|2003Cited by 220
Seven-year follow-up of a randomized clinical trial comparing proton-pump inhibition with surgical therapy for reflux oesophagitisLars Lundell, A. Walan, Pekka Miettinen et al.|British journal of surgery|2007Cited by 171
MAINTENANCE TREATMENT OF RECURRENT PEPTIC ULCER BY CIMETIDINEG. Bodemar, A. Walan|The Lancet|1978Cited by 170