TY - STAND
AU - L. Derby
AU - H. Jick
BT - Epidemiology
M1 - 2
PY - 1998
SP - 205
EP - 7
T2 - Epidemiology
TI - Appendectomy protects against ulcerative colitis
VL - 9
SN - 1044-3983 (Print) 1044-3983
ER -