TY - GEN AU - Johnston,D W TI - Annular pancreas: a new classification and clinical observations SN - 0008-428X PY - 1978///0724 KW - Aged KW - Classification KW - Duodenal Ulcer KW - etiology KW - Gastrointestinal Diseases KW - Humans KW - Infant, Newborn KW - Middle Aged KW - Pancreas KW - abnormalities N1 - Publication Type: Case Reports; Journal Article ER -