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Martins-Júnior, Paulo Antônio; Ramos-Jorge, Joana; Paiva, Saul Martins; Marques, Leandro Silva; Ramos-Jorge, Maria Letícia . (2012). Validations of the Brazilian version of the Early Childhood Oral Health Impact Scale (ECOHIS). Cadernos de Saúde Pública, 28(2), 367–374. doi:10.1590/s0102-311x2012000200015 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research