Objective: To assess the validity of a semi-quantitative food-frequency questionnaire (SFFQ) used in a large nation-wide dietary survey among 12-month-old Norwegian infants. Methods: The SFFQ was ...

Correspondence to Dr A Hirschmüller, Department of Orthopedics and Trauma Surgery, Medical Center—University of Freiburg, Center for Surgery, Hugstetter Str. 55, Freiburg im Breisgau D-79106, Germany; ...

Background Validation of instruments used to measure physical activity patterns is essential when attempting to assess the effectiveness of physical activity interventions. Objectives To assess the ...