UpToDate: “Overview of pulmonary function screening in adults.”

National Institutes of Health and fitness: “Usefulness of harmonica playing to improve outcomes in clients with continual obstructive pulmonary disorder.”

Catawba Valley Overall health Process: “Top 5 COPD Myths Debunked in Favor of Improved Respiration.”

COPD Foundation: “Breathing via New music: COPD360o Harmonicas for Health™.”

Cleveland Clinic: “Pursed Lip Respiration.”

CDC: “Leading Causes of Dying.”

Merck Manual: “Shortness of Breath.”

Harvard Wellbeing Publishing: “Chronic obstructive pulmonary disorder: It takes your breath absent.”

Stephanie Williams, respiratory therapist and senior director of local community education and learning systems, COPD Foundation.

Mary Hart, director of investigate, Allergy & Asthma Community.

Mark Millard, MD, clinical director, Baylor Martha Foster Lung Care Center Wanda and Collins Burton Endowed Chair in Pulmonology, Baylor College Health care Middle, Dallas.

Doug Martin, 68, Nashville, TN.