21689
 What we 're trying to do is reconcile why there is such a disconnect , or paradox , between the observational trials and the randomized controlled trials , '' said Dr. Isaac Schiff , chief of obstetrics and gynecology at Massachusetts General Hospital in Boston and chairman of a report on hormone therapy for the American College of Obstetricians and Gynecologists . 
 location contains: Boston, Massachusetts General Hospital
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
 Entity Pairs:  Boston, Massachusetts General Hospital 
Answer:
 location contains: Boston, Massachusetts General Hospital