TY - GEN AU - BRADY,J V AU - PORTER,R W AU - CONRAD,D G AU - MASON,J W TI - Avoidance behavior and the development of gastroduodenal ulcers SN - 0022-5002 PY - 1998///1101 KW - Humans KW - Learning KW - Peptic Ulcer N1 - Publication Type: Journal Article UR - https://doi.org/10.1901/jeab.1958.1-69 ER -