background : a detailed study of hidden and hard to reach populations in order to identify their characteristics is essential because they endanger the health of the society by their dangerous behaviors. however, sampling in these populations through conventional sampling methods is impossible due to reasons such as being hidden and lacking a precise frame. methods: in this article, applicable ...

results seven concepts emerged after exploratory factor analysis of the 48 items. the content validity ratio (cvr) of the questionnaire constructs were 0.55 to 0.76, and content validity index (cvi) structure was 0.86 to 0.95. cronbach's alpha coefficient for the entire questionnaire was 0.78, and correlation coefficient of the test-retest reliability for the constructs was from 0.73 to 0.89. c...

in order to survey the evolutionary history and impact of historical events on the genetic structure of iranian people, the hv2 region of 141 mtdna sequences related to six iranian populations were analyzed. slight and non-significant fst distances among the central-western persian speaking populations of iran testify to the common origin of these populations from one proto-population. mismatch...