https://jamanetwork.com/journals/jamaneurology/fullarticle/1697440
https://academic.oup.com/brain/article/136/10/3151/327490
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3722347/
https://www.sciencedirect.com/science/article/pii/S1568997212000614?via%3Dihub
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3348613/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3718498/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3705178/
http://n.neurology.org/content/77/2/179.long
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3299076/
http://www.pedneur.com/article/S0887-8994(11)00415-2/fulltext