Identifying Walking Trips From GPS and Accelerometer Data in Adolescent Females. - Rodriguez, Daniel A.; Cho, Gi-Hyoug; Elder, John P.; Conway, Terry L.; Evenson, Kelly R.; Ghosh-Dastidar, Bonnie; Shay, Elizabeth; Cohen, Deborah; Veblen-Mortenson, Sara; Pickrell, Julie; Lytle, Leslie (Journal of Physical Activity & Health, 2012)