The logo of the Rede D'Or Sao Luiz SA hospitals chain is pictured at Rios D'or Hospital in Rio de Janeiro, Brazil December 2, 2015. Investment bank Grupo BTG Pactual will sell a stake in Brazil's largest hospital chain, Rede D'Or Sao Luiz SA, to Singapore sovereign wealth fund GIC Pte Ltd for about 2.38 billion reais ($619 million), the bank said on Wednesday. REUTERS/Ricardo Moraes