All participants donate 2 ml of saliva for DNA. Saliva is collected into SDNA-1000 kits from Spectrum Solutions™ (Draper, Utah, USA), which stabilize the DNA for shipping and storage at room temperature. Participants are instructed not to eat, drink, smoke, or chew gum for 30 minutes prior to collecting the sample. Participants recruited in person are provided a saliva kit for sampling during their appointment, while those recruited online are mailed a saliva kit with a prepaid return envelope.
DNA from 1 ml of saliva is extracted in an automated fashion using Maxwell® RSC Stabilized Saliva DNA Kits and a Maxwell® RSC 48 Instrument from Promega (Madison, Wisconsin, USA). The remaining saliva solution is frozen at −80 degrees C.
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