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postal questionnaires for physical activity and diet: social patterning in valid responses - http://t.co/yRI5UEDNEL
postal questionnaires for physical activity and diet: social patterning in valid responses - http://t.co/yRI5UEDNEL
Postal questionnaires to evaluate physical activity and diet change: implications of responder characteristics http://t.co/vre9iFRxmq
Postal questionnaires to evaluate physical activity and diet change: implications of responder characteristics http://t.co/vre9iFRxmq
Postal questionnaires to evaluate physical activity and diet change: implications of responder characteristics http://t.co/vre9iFRxmq