Exposure to secondhand smoke among patients with asthma: a cross-sectional study - Lima, Liranei Limoeiro; Cruz, Constança Margarida Sampaio; Fernandes, Andréia Guedes Oliva; Pinheiro, Gabriela Pimentel; Souza-Machado, Carolina de; Lima, Valmar Bião; Mello, Luane Marques de; Cruz, Álvaro Augusto (Einstein, 2020)