Harmonicas and COPD
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- Orenstein BW. 4 Surprising Ways to Ease COPD. Stroke Center - EverydayHealth.com. https://www.everydayhealth.com/news/4-surprising-ways-ease-copd/. Published October 23, 2015. Accessed February 1, 2019.
- COPD: Harmonicas for Better Health? KSAT. https://www.ksat.com/health/copd-harmonicas-for-better-health. Published May 10, 2018. Accessed February 1, 2019.