@book{520016,
	author = {ClinicalKey eBooks.},
	title = {Gastrointestinal endoscopy.},
	publisher = {American Society for Gastrointestinal Endoscopy},
	address = {[Baltimore] :},
	url = {http://ezproxy.alfaisal.edu/login?url=https://www.clinicalkey.com/dura/browse/journalIssue/00165107}
}