Kalalo, Lina, Diana Takumansang-Sondakh, and Audrey Wahani. 2013. “Cotinine and Interferon-Gamma Levels in Pre-School Children Exposed to Household Tobacco Smoke”. Paediatrica Indonesiana 53 (5), 287-90. https://doi.org/10.14238/pi53.5.2013.287-90.