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In 1948 , Maurice M. Rapport , Arda Green , and Irvine Page of the Cleveland Clinic discovered a vasoconstrictor substance in blood serum , and since it was a serum agent affecting vascular tone , they named it serotonin .
 person: Maurice M. Rapport; person: Arda Green; person: Irvine Page; organization: Cleveland Clinic
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Maurice M. Rapport; person: Arda Green; person: Irvine Page; organization: Cleveland Clinic