1. Colonoscopy findings in symptomatic patients without X-ray evidence of colonic neoplasms;Aldridge, M.C.; Sim, A.J.W.;Lancet,1986
2. Colonoscopy or barium enema as initial investigation of colonic disease;Durdey, P.; Weston, P.M.T.; Williams, N.S.;Lancet,1987
3. Colonoscopy and barium enemas;Aldridge, M.C.; Sim, A.J.W.;Lancet,1986
4. Double-contrast barium enema;Williams, N.W.; Durdey, P.; Weston, P.M.T.;Lancet,1987
5. Attitudes to malaria prophylaxis;Walker, E.;BrMedJ,1981