On the Validity of Mailed Questionnaires in Diagnosing “Angina Pectoris’’ and “Bronchitis”

Abstract
(1966). On the Validity of Mailed Questionnaires in Diagnosing “Angina Pectoris’’ and “Bronchitis”. Archives of Environmental Health: An International Journal: Vol. 13, No. 6, pp. 738-742.