Introduction to a Collection of Physical Activity Questionnaires. Andrea M. Kriska, C. J. C. Medicine & Science in Sports & Exercise, 29(6):5 – 9, 1997.
bibtex   
@article{andrea_m._kriska_introduction_1997,
	title = {Introduction to a {Collection} of {Physical} {Activity} {Questionnaires}},
	volume = {29},
	issn = {0195-9131},
	number = {6},
	urldate = {2014-08-18},
	journal = {Medicine \& Science in Sports \& Exercise},
	author = {Andrea M. Kriska, Carl J. Caspersen},
	year = {1997},
	pages = {5 -- 9},
}

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