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R correlation from primary care research to inform study design and analysis. J Clin Epidemiol 2004, 57 (8):785?94. 52. Schulz KF, et al: CONSORT 2010 Statement: updated guidelines for reporting parallel group randomised trials. BMC Med 2010, 63(8):834?40.doi:10.1186/1471-2393-12-155 Cite this article as: Kempler et al.: Sleep education during pregnancy for new mothers. BMC Pregnancy and Childbirt