PREVALENCE OF OBSTRUCTIVE SLEEP APNEA (OSA) RISK AND SLEEP QUALITY OF LIFE (SQOL) AMONG COPD PATIENTS OF A TERTIARY CARE HOSPITAL, LUDHIANA, PUNJAB. Journal title: International Journal of Advanced Research (IJAR) Authors: Gaganpreet kaur, Bindu K, Prabhjot Saini, Anil Kumar Kashyap. Subject(s):