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Aspiration
Chronic obstructive pulmonary disease
2
Copd
2
Distal
2
Esophageal pH monitoringLung-Disease
2
Fibrosis
2
Gastroesophageal reflux
2
Gerd
2
High-resolution esophageal manometry
2
Northern Sweden
2
Prevalence
2
Smoking
2
Alaska Natives
1
Educational Attitudes
1
Eskimos
1
High School Graduates
1
High School Students
1
High Schools
1
Higher Education
1
Rural to Urban Migration
1
Sex Differences
1
Sociology
1
Student Attitudes
1
Young Adults
1
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