3731
In 1991 , thousands of anti-abortion protesters blockaded and held sit-ins at Wichita abortion clinics , particularly the clinic of George Tiller .
 person: George Tiller
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: George Tiller