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http://t.co/MejhhHSFkB physical activity surveys....
http://t.co/MejhhHSFkB physical activity surveys....
Comparing physical activity questionnaires- a sys review http://t.co/LSzDay3HjW
The majority of physical activity questionnaires have good reliability but mediocre validity; http://t.co/YjoV6Zvp
Research: Systematic review of reliability and objective criterion-related validity of physical activity questionnaires http://t.co/MBl8C8rj