(Q72813015)
Statements
On the validity of mailed questionnaires in diagnosing "angina pectoris" and "bronchitis" (English)
On the Validity of Mailed Questionnaires in Diagnosing “Angina Pectoris’’ and “Bronchitis” (English)
R. Cederlöf
E. Jonsson
1 December 1966
Cederlöf R.