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Berra, S; Ravens-Sieberer, U; Erhart, M; Tebé, C; Bisegger, C; Duer, W; von Rueden, U; Herdman, M; Alonso, J; Rajmil, L; European, KIDSCREEN group [kidscreen] (2007). Methods and representativeness of a European survey in children and adolescents: the KIDSCREEN study. BMC public health, 7, p. 182. London: BioMed Central 10.1186/1471-2458-7-182
