Alwashmi M, Hawboldt J, Davis E, Marra C, Gamble J-M, Ashour WA. JMIR mHealth and uHealth. The effect of smartphone interventions on patients with chronic obstructive pulmonary disease exacerbations: A systematic review and meta-analysis [Internet]. 2016;Available from: http://www.scopus.com/inward/record.url?eid=2-s2.0-85019981382&partnerID=MN8TOARS