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Purposes To detect the frequency and types of chromosomal anomalies with non-obstructive azoospermia and severe oligozoospermia in Northeast China, and to compare the frequencies with other regions of China and the world. To investigate the general characteristics of this population. Methods Eighty-one men with non-obstructive azoospermia and 54 men with severe oligozoospermia were recruited. Karyotype...
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