Corrigendum: Decreased Exosomal Acetylcholinesterase Activity in the Plasma of Patients With Parkinson's Disease - Shim, Kyu Hwan; Go, Han Gyeol; Bae, Heewon; Jeong, Da-Eun; Kim, Danyeong; Youn, Young Chul; Kim, SangYun; An, Seong Soo A.; Kang, Min Ju (Frontiers in Aging Neuroscience, 2021)