Nascimento, I.J.B. do, Oliveira, J.A. de Q., Wolff, I.S., Ribeiro, L.D., Silva, M.V.R.S. e, Cardoso, C.S., Mars, M., Ribeiro, A.L. and Marcolino, M.S. 2020. Use of smartphone-based instant messaging services in medical practice: a cross-sectional study. São Paulo Medical Journal. 138, 1 (Feb. 2020), 86–92.