Comparison of the drug concentrations in oral fluid collected by two sampling methods (Varian OraLab and Statsure Saliva•Sampler)Alain Verstraete, An-Sofie Goessaert et Jolien VerammeAnn Toxicol Anal, 23 3 (2011) 133-138DOI: https://doi.org/10.1051/ata/2011121