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