“…Previous reports concerning coexisting DD in patients presenting with PD show ranges varying from 0.01 to 58.8%, a positive family history for PD in 1-4% and a positive family history for DD in 9.8% (Table 2). 5,9,[14][15][16][17][18][19][20][21][22][23][24] The series from the UK, Italy, Australia and Serbia show the highest percentage of PD patients with coexisting DD. 9,15,17,19,24 The two reports focusing on PD patients o40 years show a lower percentage of coexisting DD.…”