Duodenal Ulcer with Massive Gastrointestinal Hemorrhage as an Initial Manifestation in Multiple Myeloma with Extramedullary Disease: A Case Report by Hao-Tse Chiu, Po-Huang Chen, Hao Yen, Chao-Yang Chen, Chih-Wei Yang, Yu-Hong Liu, Wu-Feng Hsieh, Shih-Hao Chou, Ta-Wei Pu

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