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المصدر: JMIR Research Protocols
مصطلحات موضوعية: Spirometry, medicine.medical_specialty, cross-sectional, Passive smoking, Cross-sectional study, medicine.drug_class, medicine.disease_cause, 03 medical and health sciences, 0302 clinical medicine, Internal medicine, Bronchodilator, Epidemiology, medicine, Protocol, COPD, tobacco smoking, risk factors, 030212 general & internal medicine, medicine.diagnostic_test, business.industry, General Medicine, Anthropometry, medicine.disease, Kazakhstan, respiratory tract diseases, 030228 respiratory system, Physical therapy, Observational study, business, study protocol