Extraocular muscle atrophy and central nervous system involvement in chronic progressive external ophthalmoplegia. oleh Cynthia Yu-Wai-Man, Fiona E Smith, Michael J Firbank, Grant Guthrie, Stuart Guthrie, Grainne S Gorman, Robert W Taylor, Douglass M Turnbull, Philip G Griffiths, Andrew M Blamire, Patrick F Chinnery, Patrick Yu-Wai-Man