Study design diagram. The number of matching plasma and DBS samples used for each phase of the study are given in the boxes on the left and the number of matching DBS and plasma samples tested for each of the assays are given in the boxes on the right. RPR has been performed on plasma, not on DBS.
Smit et al. BMC Infectious Diseases 2013 13:102 doi:10.1186/1471-2334-13-102