TY  - BOOK
AU  - Cotton, P B
AU  - Williams, C B
TI  - Practical gastrointestinal endoscopy
SN  - 0632027061
PY  - 1990///
PB  - Blackwell Sci
KW  - Endoscopy
KW  - Diagnosis
KW  - Gastrointestinal diseases
ER  -