Schmidt, W.-P., Genser, B., Luby, S. P. and Chalabi, Z. (2011) “Estimating the Effect of Recurrent Infectious Diseases on Nutritional Status: Sampling Frequency, Sample-size, and Bias”, Journal of Health, Population and Nutrition, 29(4), pp. 317–326. doi: 10.3329/jhpn.v29i4.8447.