Penston JG, Crombie IK, Waugh NR, Wormsley KG.
Trends in morbidity and mortality from peptic ulcer disease: Tayside versus Scotland.
Alimentary Pharmacology and Therapeutics 1993 Aug;7(4):429-42.
Boyd EJ, Penston JG, Wormsley KG.
Maintenance therapy in duodenal and gastric ulcer disease: survey of practice amongst British gastroenterologists.
Alimentary Pharmacology and Therapeutics 1992 Dec;6(6):727-37.
Penston JG, Pounder RE.
A survey of dyspepsia in Great Britain.
Alimentary Pharmacology and Therapeutics 1996 Feb;10(1):83-9.