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Of paramount importance to determine the number, size and composition of "focus groups", because of the error in determining the group adversely affect the results of the study. As is well known, this method does not involve the use of sampling, as its main objective the understanding of the phenomenon to be investigated rather than extrapolating findings to large social community. The most important principle in forming groups, ensuring uniformity, homogeneity of the composition of the groups. The authors suggested the following criteria on the basis of which was formed by the "focus group" of experts:
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