Genetic epidemiology of β‐thalassemia in sicily: Do sequences 5′ to the <sup>G</sup>γ gene and 5′ to the β gene interact to enhance HbF expression in β‐thalassemia?Angela Ragusa, Rajagopal Krishnamoorthy, R L Nagel et al.|American Journal of Hematology|1992Cited by 41