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Detmar, SB; Bruil, J; Ravens-Sieberer, U; Gosch, A; Bisegger, C; European, KIDSCREEN group (2006). The use of focus groups in the development of the KIDSCREEN HRQL questionnaire. Quality of life research, 15(8), 1345-53. Epub 2006 Jul 7.. Dordrecht: Springer 10.1007/s11136-006-0022-z
