https://www.ssa.gov/planners/disability/qualify.html
https://www.ssa.gov/planners/retire/AnypiaApplet.html
https://www.ssa.gov/disability/professionals/bluebook/
https://www.ssa.gov/benefits/ssi
https://www.ssa.gov/ssi/text-eligibility-ussi.htm
https://www.ssa.gov/compassionateallowances/
https://www.ssa.gov/compassionateallowances/conditions.htm