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Stein Backes, D. .; Silveira Colomé, J. .; Herdmann Erdmann, R. .; Lerch Lunardi, V. The Focal Group As a Technique for Data Collection and Analysis in Qualitative Research: DOI: 10.15343/0104-7809.2011354438442. Mundo Saude 2011, 35, 438-442.