A pragmatic multi-center trial of goal-directed fluid management based on pulse pressure variation monitoring during high-risk surgery - Malbouisson, Luiz Marcelo Sá; Silva Jr., João Manoel; Carmona, Maria José Carvalho; Lopes, Marcel Rezende; Assunção, Murilo Santucci; Valiatti, Jorge Luís dos Santos; Simões, Claudia Marques; Auler Jr., José Otavio Costa (BMC Anesthesiology, 2017)