Prospective cohort studies to evaluate the safety and immunogenicity of the 2013, 2014, and 2015 seasonal influenza vaccines produced by Instituto Butantan by Mondini, G, Braga, P, Lopes, M, Sartori, A, Miyaji, K, Infante, V, Randi, B, Timenetsky, M, Ferreira, J, Sakita, N, Precioso, A