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https://radiopaedia.org/articles/hummingbird-sign-midbrain
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2812742/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3525042/
http://www.mmj.eg.net/article.asp?issn=1110-2098;year=2017;volume=30;issue=1;spage=325;epage=326;aulast=Jalal
https://www.brainsupportnetwork.org/hummingbird-sign-and-mickey-mouse-sign-in-psp/
http://casereports.bmj.com/content/2012/bcr-2012-006263.full
https://www.sciencedirect.com/science/article/pii/S1353802018301500
http://n.neurology.org/epearls/20130624
http://www.dusanpavlovic.com/hummingbird-mickey-mouse-sign/
https://www.researchgate.net/post/is_the_hummingbird_sign_a_reliable_sign_for_diagnosis_of_PSP
https://en.wikipedia.org/wiki/Progressive_supranuclear_palsy
https://onlinelibrary.wiley.com/doi/full/10.1111/1754-9485.12613
http://n.neurology.org/content/neurology/80/20/1856.full.pdf