Chromatographic diagnosis of maple syrup urine disease by measuring the l-alloisoleucine/l-phenylalanine ratio in dried blood spots - Jeong, Ji-Seon; Sim, Hee-Jung; Lee, Yong-Moon; Yoon, Hye-Ran; Kwon, Ha-Jeong; Hong, Seon-Pyo (Journal of Chromatography B: Analytical Technologies in the Biomedical & Life Sciences, 2011)