What is the field of study of the journal that published "Safety of enteral naloxone for the reversal of opiate-induced constipation in the intensive care unit"?
SELECT ?answer WHERE { wd:Q45219303 wdt:P1433 ?X . ?X wdt:P101 ?answer}
safety of enteral naloxone for the reversal of opiate-induced constipation in the intensive care unit.: Q45219303