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Frontiers in Psychology|February 21, 2015
Measurement equivalence in mixed mode surveysJoop J Hox, Edith D De Leeuw, Eva A O ZijlmansJournal of Clinical Epidemiology|April 3, 2002
Attrition in the Longitudinal Aging Study Amsterdam. The effect of differential inclusion in side studiesDorly J H Deeg, Theo van Tilburg, Johannes H Smit, et al.Pageof 1