Janss A, Sladky J, Chatten J, Johnson J
Department of Neurology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA.
Med Pediatr Oncol. 1996 Apr;26(4):272-9. doi: 10.1002/(SICI)1096-911X(199604)26:4<272::AID-MPO11>3.0.CO;2-H.