Decreased extra-renal urate excretion is a common cause of hyperuricemia - Ichida, K; Matsuo, H; Takada, T; Nakayama, A; Murakami, K; Shimizu, T; Yamanashi, Y; Kasuga, H; Nakashima, H; Nakamura, T; Takada, Y; Kawamura, Y; Inoue, H; Okada, C; Utsumi, Y; Ikebuchi, Y; Ito, K; Nakamura, M; Shinohara, Y; Hosoyamada, M; Sakurai, Y; Shinomiya, N; Hosoya, T; Suzuki, H (Nat Commun, 2012)