Obesity-Driven Exacerbation of Obstructive Sleep Apnea Severity in COPD: A Cross-Sectional Polysomnographic Study from Pakistan. Body Mass Index and Neck Circumference As Independent Predictors of Apnea Severity in the COPD–OSA Overlap. Pjmcr 2026, 5 (2), 6975-6985. https://doi.org/10.66021/pakmcr1502.