Rahmi Annisa Syarli, et al. “The Association Between Parental Smoking Habits and the Incidence of Lower Respiratory Tract Infections in Children Under Five Years of Age: A Systematic Review”. The International Journal of Medical Science and Health Research, vol. 18, no. 2, Oct. 2025, pp. 1-43, https://doi.org/10.70070/xqf1f521.