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Oliveira, Luis de Pinho; Pereira, Maria Lurdes; Azevedo, Ana; Lunet, Nuno . (2012). Risk factors for cardiovascular disease among the homeless and in the general population of the city of Porto, Portugal. Cadernos de Saúde Pública, 28(8), 1517–1529. doi:10.1590/s0102-311x2012000800010 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research