1. Month SR, Wood RW, Trifillis PT, et al. Analysis of the 5' flanking regions of the gamma globin genes from major african haplotype backgrounds associated with sickle cell disease. J Clin Invest. 1990;85:364-370.
2. Mukherjee MB, Lu CY, Ducrocq R, et al. Effect of α-thalassemia on sickle-cell anemia linked to the Arab-Indian haplotype in India. Am J Hematol. 1997;55:104-109.
3. Kulozik AE, Kar BC, Satapathy RK, et al. Fetal hemoglobin levels and βS globin haplotype in an Indian population with sickle cell disease. Blood. 1987;69:1742-1746.
4. Gamer C, Tatu T, Reitter E, et al. Genetic influence on F cells and other hematologic variables: A twin heritability study. Blood. 2000;95:342-346.
5. Dover GJ, Smith KD, Chang YC, et al. Fetal hemoglobin levels in sickle cell disease and normal individuals are partially controlled by an X-Linked gene located at Xp22.2. Blood. 1992;80:816-824.