TY  - BOOK
AU  - Cotton,P B
AU  - Williams C B
TI  - Practical gastrointestinal endoscopy: the fundamentals 
SN  - 9781405159029
PY  - 2008///
CY  - Oxford
PB  -  Wiley-Blackwell
KW  - Endoscopy
KW  - Gastrointestinal diseases
KW  - Colonoscopy
KW  - Sigmoidoscopy
ER  -