RT Journal Article SR Electronic T1 Paracervical block anesthesia in labour JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 262 OP 267 VO 94 IS 6 A1 I. G. Van Praagh A1 W. G. Povey YR 1966 UL http://www.cmaj.ca/content/94/6/262.abstract