RT Journal Article SR Electronic T1 How to treat Parkinson's disease in 2013 JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 93 OP 96 DO 10.7861/clinmedicine.13-1-93 VO 13 IS 1 A1 Paul F Worth YR 2013 UL http://www.rcpjournals.org/content/13/1/93.abstract