RT Journal Article SR Electronic T1 Epidural analgesia during labour JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1628 OP 1630 VO 149 IS 11 A1 Yee, I. A1 MacKinnon, T. A1 Watson, J. A1 Millman, W. L. A1 Fuller, J. A1 Butler, R. A1 Dain, S. A1 Parkin, J. A1 White, B. A1 Gverzdys, S. YR 1993 UL http://www.cmaj.ca/content/149/11/1628.abstract