Jasin, M. R., Setyanto, D. B., Hadinegoro, S. R., Lisnawati, L., Gayatri, P., & Kurniati, N. (2015). Efficacy of sputum induction from lower respiratory tract in children. Paediatrica Indonesiana, 55(2), 101-8. https://doi.org/10.14238/pi55.2.2015.101-8