Empowering Self-Efficacy by Using Patient Empowerment among Chronic Obstructive Pulmonary Disease: Pre–Post-Test Study oleh Rasha Elsayed Ahmed, Izzeddin A. Bdair, Khalid AL-Mugheed, Shadia Hamoud Alshahrani, Mesheil M. Alalyani, Ramasubbamma Ramaiah, Seham I. Abdelrahman, Sanaa Ahmed Mahmoud, Mervat Moustafa Arrab