Caparros-L efebvre and Elbaz (1999) reported in Guadeloupe, atypical parkinsonism was abnormally frequent, and represented 75% of progressive parkinsonism while Parkinson's disease accounted for only 25% of the cases.

inversed percentage in comparison with patients living in Europe and North America.

A higher proportion of patients with atypical parkinsonism (consumed soursop fruit 97%; consumed herbal tea 83%) than patients with Parkinson's disease (fruit 59%; herbal tea 18%) or control with no Parkinson symptoms (fruit 60%; herbal tea 43%).