W van Mechelen1, G J Mellenbergh
1Institute for Research in Extramural Medicine and Department of Social Medicine, Faculty of Medicine, Vrije Universiteit Amsterdam, The Netherlands. W.van_Mechelen.EMGO@MED.VU.NL
Longitudinal studies are crucial for understanding human development, but face methodological and practical challenges. This paper addresses these issues to ensure the relevance and validity of study findings in public health and medicine.
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