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2. Three primary tumors and no metastasis;Thomalla;Hosp. Pract.,1986
3. Multiple primary cancers;Schottenfeld,1982
4. Studies in malignant tumors of the testis: bilateral testicular cancer. Incidence, nature, and bearing among management of patient with single testicular cancer;Hamilton;Cancer Res.,1942
5. The probability of the chance occurrence of multiple malignant neoplasms;Bugher;Amer. J. Cancer,1934