Prot #ALN-TTRSC-004: ENDEAVOR: A Phase 3 Multicenter, Multinational, Randomized, Double-Blind, Placebo-Controlled Study to Evaluate the Efficacy and Safety of ALN-TTRSC in Patients with Transthyretin (TTR) Mediated Familial Amyloidotic Cardiomyopathy (FAC