@book{520328,
	author = {ClinicalKey eBooks.},
	title = {Gastrointestinal endoscopy clinics of North America.},
	publisher = {W.B. Saunders Co.},
	address = {Philadelphia :},
	note = {Each issue has also a distinctive title.},
	url = {http://ezproxy.alfaisal.edu/login?url=https://www.clinicalkey.com/dura/browse/journalIssue/10525157}
}