9658
Because of concerns regarding blood transfusion - related communicable disease ( eg , acquired immune deficiency syndrome and non - A , non - B hepatitis ) , there has been increasing research effort into postoperative hemorrhage related to cardiopulmonary bypass with extracorporeal circulation .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None