How the United States and Russia compare in eye care.
D016039:Corneal Transplantation; D003452:Cryosurgery; D005128:Eye Diseases / Q000628:therapy; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D009885:Ophthalmology / Q000193:education* / Q000266:history; D012426:Russia; D014184:Transplantation, Homologous; D014481:United States