Reproducibility and performance of one or two samples of salivary cortisol in the diagnosis of Cushing’s syndrome using an automated immunoassay system - Carrasco, C A; Garcia, M; Goycoolea, M; Cerda, J; Bertherat, J; Padilla, O; Meza, D; Wohllk, N; Quiroga, T (Endocrine, 2012)