127971
Dr. Sarwark is an active member of the Pediatric Orthopaedic Society of North America ( POSNA ) on which he has twice served as a member of its Board of Directors and as Ex Officio member .
 Sarwark, Orthopaedic
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sarwark, Orthopaedic