The Use of a Smartphone App and an Activity Tracker to Promote Physical Activity in the Management of Chronic Obstructive Pulmonary Disease: Randomized Controlled Feasibility Study by Bentley, Claire L, Powell, Lauren, Potter, Stephen, Parker, Jack, Mountain, Gail A, Bartlett, Yvonne Kiera, Farwer, Jochen, O'Connor, Cath, Burns, Jennifer, Cresswell, Rachel L, Dunn, Heather D, Hawley, Mark S

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