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formdate_ql under General Health/Medical Outcomes Study Short Form (SF-36)/SHHS2 in SHHS variables
Date of Quality of Life (QOL) form
stdatep under Sleep Monitoring/Polysomnography/Administrative in SHHS variables
formdate_ms under Sleep Monitoring/Polysomnography/Evening and Morning Survey/SHHS2 in SHHS variables
Date of Morning Survey form