Bastos Maria Helena, Diniz Simone G, Riesco Maria Luiza, de Oliveira Sonia Junqueira
Centre for Research for Midwifery and Childbirth, Thames Valley University, London, UK.
Midwifery. 2007 Jun;23(2):111-2. doi: 10.1016/j.midw.2007.03.003. Epub 2007 May 7.