At the end of the study visit, saliva samples were collected with a DNA collection kit (OG-500, DNA Genotek, Canada). Genomic DNA was isolated according to the manufacturer’s instructions (prepIT-L2P, DNA Genotek, Canada). The E756 locus was amplified with the primers described in Ma et al. (26 (link)), and the amplicon was sequenced (Microsynth AG, Switzerland) to distinguish E756del carriers from noncarriers.
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