Wongsiridej, P., Ngerncham, S., Usaha, S., Chandranipapongse, W., Tim R. Cressey, & Bowornkitiwong, W. (2021). Serum Theophylline Concentrations in very Preterm Neonates Receiving Intravenous Aminophylline for Apnea. Siriraj Medical Journal, 73(8), 526–531. https://doi.org/10.33192/Smj.2021.68