1. Fitbit®: An accurate and reliable device for wireless physical activity tracking Diaz, Keith M.; Krupka, David J.; Chang, Melinda J.; Peacock, James; Ma, Yao; Goldsmith, Jeff; Schwartz, Joseph E.; Davidson, Karina W. 2015 Articles Fitness walkingExercise--MeasurementBiotechnology--Health aspectsBiomedical engineering