fix the link.

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送交者: steven 于 2006-12-17, 21:45:49:

回答: a question regarding "umbilical cord when coiled around the fetal neck." 由 steven 于 2006-12-17, 21:43:18:

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=5063637&dopt=Abstract


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