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Subjects
- Minority Groups1
- Outcome Assessment (Health Care)1
- Parent-Child Relations1
- Phonation1
- Poverty1
- Prevalence1
- Pulmonary Disease, Chronic Obstructive -- diagnosis1
- Pulmonary Disease, Chronic Obstructive -- epidemiology1
- Quality of Life1
- Reading1
- Risk Factors1
- Sex Factors1
- Singing1
- Smoking -- adverse effects1
- Socioeconomic Factors1
- Speech1
- Spirometry1
- State Government1