Yap, P., Müller, I., Walter, C., Seelig, H., Gerber, M., Steinmann, P., Damons, B., Smith, D., Gall, S., Bänninger, D., Hager, T., Htun, N., Steenkamp, L., Gresse, A., Probst-Hensch, N., Utzinger, J., Du Randt, R. and Pühse, U. (2015). Disease, activity and schoolchildren’s health (DASH) in Port Elizabeth, South Africa: a study protocol BMC Public Health, doi: 10.1186/s12889-015-2636-y.