Prevalence of the HLA-DQB1*0602 allele in narcolepsy and idiopathic hypersomnia patients seen at a sleep disorders outpatient unit in São Paulo - Coelho, Fernando Morgadinho Santos; Pradella-Hallinan, Márcia; Pedrazzoli Neto, Mario; Bittencourt, Lia Rita Azeredo; Tufik, Sergio (Revista Brasileira de Psiquiatria, 2009)