Efficacy and Acceptability of a Mobile App for Monitoring the Clinical Status of Patients With Chronic Obstructive Pulmonary Disease Receiving Home Oxygen Therapy: Randomized Controlled Trial - Anisbed Naranjo-Rojas; Luis Ángel Perula-de Torres; Freiser Eccehomo Cruz-Mosquera; Guillermo Molina-Recio (Journal of Medical Internet Research)