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Subjects
- Respiratory Tract Diseases -- prevention & control[remove]10
- Respiration4
- Cough2
- Hygiene2
- Child1
- Clinical Trials as Topic1
- Health Behavior1
- Heating1
- Military Personnel1
- Ontario1
- Respiratory Physiological Phenomena1
- Respiratory Tract Diseases -- etiology1
- Respiratory Tract Diseases -- therapy1
- Smoking -- adverse effects1
- Sneezing1
- Sulfadiazine -- therapeutic use1
- World War II1
