TY - GEN AU - Calne,D B TI - Parkinson's disease over the last 20 years: a personal view SN - 0393-5264 PY - 1989///0601 KW - History, 20th Century KW - Humans KW - Levodopa KW - therapeutic use KW - Parkinson Disease KW - drug therapy N1 - Publication Type: Historical Article; Journal Article; Review ER -