Relative values of longitudinal, cross-sectional and mixed data collection in community studies.
D000886:Anthropometry; D002648:Child; D003906:Developing Countries; D005069:Evaluation Studies as Topic; D006801:Humans; D009748:Nutrition Disorders / Q000453:epidemiology; D009747:Nutritional Physiological Phenomena; D011446:Prospective Studies; D011502:Protein-Energy Malnutrition / Q000453:epidemiology; D011634:Public Health; D012189:Retrospective Studies; D012494:Sampling Studies