Publications by authors named "Ralf Wetzel"

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Effects of phone versus mail survey methods on the measurement of health-related quality of life and emotional and behavioural problems in adolescents.
Michael Erhart, Ralf M Wetzel, André Krügel, Ulrike Ravens-Sieberer

BMC Public Health· December 2009

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Phone respondents reported less mental health problems whereas mail interviewee gave higher physical health ratings.
Ulrike Ravens-Sieberer, Michael Erhart, Ralf Wetzel, André Krügel, Anett Brambosch

J Clin Epidemiol· October 2008

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Generic health-related quality-of-life assessment in children and adolescents: methodological considerations.
Ulrike Ravens-Sieberer, Michael Erhart, Nora Wille, Ralf Wetzel, Jennifer Nickel

Pharmacoeconomics· February 2007

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