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Nicholas J Wareham,
Rupert W Jakes,
Kirsten L Rennie,
Jantine Schuit,
Jo Mitchell,
Susie Hennings
and Nicholas E Day
(2003).
Validity and repeatability of a simple index derived from the short physical activity questionnaire used in the European Prospective Investigation into Cancer and Nutrition (EPIC) study. Public Health Nutrition,
6
,
pp 407-413
doi:10.1079/PHN2002439