Silva, Vera Luiza da Costa e. “Environmental Tobacco Smoke Exposure Among Non-Smoking Waiters: Measurement of Expired Carbon Monoxide Levels”. São Paulo Medical Journal 118, no. 4 (July 7, 2000): 81–82. Accessed May 21, 2026. https://periodicosapm.emnuvens.com.br/spmj/article/view/2661.