Retroperitoneal masses with associated human chorionic gonadotropin production: Report of two cases.

Duffield AS, Jarrar P, Shum C, Ahuja N, Yeo CJ, Sokoll LJ. Retroperitoneal masses with associated human chorionic gonadotropin production: Report of two cases. Clin Chim Acta. 2008 Sep; 395(1-2):166-9.

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