[1]
H. J. Pullens, M. Joosten, P. D. Siersema, and M. A. Brink, “Open-Access Flexible Sigmoidoscopy Frequently Leads to Additional Colonoscopy in Symptomatic Patients over 50 years”, JGLD, vol. 23, no. 2, pp. 153–159, Jun. 2014.