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David Connell speculates that Robert Johnson may have had Marfan's
syndrome. From a small photograph, it is difficult to comment on ptosis
but the long slender fingers may simply be a racial characteristic.
Standard measurements of metacarpal index do not apply to those of African
Refs. Walker,T M; Ashcroft, M T. British Journal of Radiology 1978;
Wachira, M W; Calder, J F; Palmer P E S. Diagnostic Imaging 1982;51:201-