Reply to: Association Between Alendronate and All-Cause Mortality and Cardiovascular Mortality Among Hip Fracture: An Alternative Explanation. - Sing CW; Wong AY; Kiel DP; Cheung EY; Lam JK; Cheung TT; Chan EW; Kung AW; Wong IC; Cheung CL (Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research, 2018)