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In 1997 , Philip W. Cook conducted a study of 55,000 members of the United States Armed Forces , finding bidirectionality in 60 - 64 % of IPV cases , as reported by both men and women .
 Philip W. Cook, United States Armed Forces
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Philip W. Cook, United States Armed Forces