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After obtaining his medical degree shortly thereafter , he continued on at the University as a professor of pathology for twenty years ; during that time he met his wife , Ora in 1937 , and started a family near the Presidio in San Francisco .
 Presidio, San Francisco
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Presidio, San Francisco