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00003081-199803000-00005
00003081-199803000-00005
http://dx.doi.org/10.1097/00003081-199803000-00005
What is the population-based risk of preterm birth among twins and other multiples?
P356
Q41721787-F3CC31F7-3ED7-43FD-910A-C496DA64CFBF
P356
00003081-199803000-00005
http://dx.doi.org/10.1097/00003081-199803000-00005