Phase 1 study of the safety and immunogenicity of a live, attenuated respiratory syncytial virus and parainfluenza virus type 3 vaccine in seronegative children - Bernstein, D I; Malkin, E; Abughali, N; Falloon, J; Yi, T; Dubovsky, FMI-CP149 Investigators (Pediatr Infect Dis J, 2012)