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Reference population for international comparisons and time trend surveillance of preterm delivery proportions in three countries

Nils-Halvdan Morken email, Ida Vogel email, Karin Kallen email, Rolv Skjærven email, Jens Langhoff-Roos email, Ulrik Schiøler Kesmodel email and Bo Jacobsson email

BMC Women's Health 2008, 8:16doi:10.1186/1472-6874-8-16

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