1. Department of Periodontics, School of Dentistry, Loma Linda University, Loma Linda, CA 92350, USA
2. Department of Pathology and Human Anatomy, School of Medicine, Loma Linda University, Loma Linda, CA 92350, USA
3. Institute for Community Partnerships, Loma Linda University Health, Loma Linda, CA 92354, USA
4. Department of Preventive Medicine, School of Medicine, Loma Linda University, Loma Linda, CA 92350, USA