Feldman HA, Johannes CB, Derby CA, Kleinman KP, Mohr BA, Araujo AB, McKinlay JB. Erectile dysfunction and coronary risk factors: prospective results from the Massachusetts Male Aging Study. Prev Med. 2000 Apr 1;30(4):328-38.
Vakil N, Hahn B, McSorley DJ. Recurrent symptoms and gastro-oesophageal reflux disease in patient with duodenal ulcer treated for helicobacter pylori infection. Aliment Pharmacol Ther. 2000 Jan;14(1):45-51.