GSTM1 and thalassemia: The three diseases covered by this program include homozygous α0-thalassemia, homozygous β0-thalassemia, and compound heterozygous β0-thalassemia/Hb E. In this study, we implemented the prevention and control program in accordance with the announcement from the Ministry of Public Health  (Yamsri et al., 2010; Fucharoen & Winichagoon, 2007).