DOI:
10.1055/s-00000020
Geburtshilfe und Frauenheilkunde
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References
World Health Organization.
Reproductive Health and Research. Care in normal birth: a practical guide.
1996 Online:
http://www.who.int/maternal_child_adolescent/documents/who_frh_msm_9624/en/ last access: 09.08.2017
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