“Serotonergic pathology and disease burden in the premotor and motor phase of A53T {alpha}-synuclein parkinsonism: a cross-sectional study,” by Heather Wilson, George Dervenoulas, Gennaro Pagano, Christos Koros, Tayyabah Yousaf, Marina Picillo, Sotirios Polychronis, Athina Simitsi, Beniamino Giordano, Zachary Chappell, Benjamin Corcoran, Maria Stamelou, Roger N. Gunn, Maria Teresa Pellecchia, Eugenii A. Rabiner, Paolo Barone, Leonidas Stefanis, and Marios Politis (Vol. 18, No. 8, August 2019, p. 748-759).
www.thelancet.com/journals/laneur/article/PIIS1474-4422(19)30140-1/fulltext