It was revealed in the 1970s that the Chuvash population is characterized by a high frequency of erythrocytosis with a significant trend to familial clustering [ 20 , 118 , 119 , 120 ].
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It was revealed in the 1970s that the Chuvash population is characterized by a high frequency of erythrocytosis with a significant trend to familial clustering [ 20 , 118 , 119 , 120 ].