TY - RPRT TI - Racial differences in sacral structure important in caudal anesthesia. AU - A Norenberg AU - D C Johanson AU - J S Gravenstein PY - 1979 DO - 10.1097/00000542-197906000-00019 UR - https://pubmed.ncbi.nlm.nih.gov/453583/ ID - 453583 ER -