“The aim of this paper is to give a basic introduction and broad overview to the readers on questionnaires for epidemiological studies.”
http://www.jpma.org.pk/full_article_text.php?article_id=3414
“The aim of this paper is to give a basic introduction and broad overview to the readers on questionnaires for epidemiological studies.”
http://www.jpma.org.pk/full_article_text.php?article_id=3414