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1 Nilsen, Roy M; Vollset, Stein Emil; Gjessing, Håkon K.; Skjærven, Rolv; Klungsøyr, Kari; Schreuder, Patricia; Alsaker, Elin Hilde Roti; Haug, Kjell; Daltveit, Anne Kjersti Nesje; Magnus, Per.
Self-selection and bias in a large prospective pregnancy cohort in Norway. Paediatric and Perinatal Epidemiology 2009 ;Volume 23.(6) p. 597-608
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