Stewart S.
Midwives Chron. 1988 Feb;101(1201):52.
PMID: 3357435

Downe S.
Midwives Chron. 1989 Mar;102(1214):93-4.
PMID: 2704325

Allison J.
Nurs Stand. 1995 Jan 11-17;9(16):22-3.
PMID: 7888318

Clay T.
Nurs Stand. 1992 May 6-12;6(33):44-5.
PMID: 1591185

Murphy R.
Nurs Times. 1993 Jan 13-19;89(2):45.
PMID: 8424083

Davies J.
Midwives Chron. 1994 Mar;107(1274):102-3.
PMID: 8127242

[No authors listed]
J Perioper Pract. 2013 Mar;23(3):38.
PMID: 23586185