{"first_sentence": {"type": "/type/text", "value": "No one fully understands what causes psoriasis yet, but doctors have several theories."}, "physical_format": "Hardcover", "last_modified": {"type": "/type/datetime", "value": "2008-04-30 09:38:13.731961"}, "languages": [{"key": "/l/eng"}], "publishers": ["Taylor & Francis"], "number_of_pages": 120, "isbn_13": ["9780415395687"], "id": 12987036, "edition_name": "4 edition", "isbn_10": ["0415395682"], "publish_date": "November 30, 2006", "key": "/b/OL9663035M", "authors": [{"key": "/a/OL2798935A"}], "title": "Psoriasis", "type": {"key": "/type/edition"}, "subjects": ["Medicine: General Issues", "Dermatology", "Medical / Dermatology", "Medical", "Medical / Nursing"], "revision": 1}