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Chainani, Vinod; Shaharyar, Sameer; Dave, Kairavee; Choksi, Vivek; Ravindranathan, Sharmila; Hanno, Ram; Jamal, Omar; Abdo, Abir; Rafeh, Nidal Abi . (2016). Objective measures of the frailty syndrome (hand grip strength and gait speed) and cardiovascular mortality: A systematic review. International Journal of Cardiology, 215(), 487–493. doi:10.1016/j.ijcard.2016.04.068 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research