RT Journal Article SR Electronic T1 Trans-nasal route. The new way of upper gastrointestinal technique diagnostic endoscopy JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 3 OP 4 VO 21 IS 1 A1 Al-Karawi, Mohamed A. YR 2000 UL http://smj.org.sa/content/21/1/3.abstract AB