1. Department of Microbiology, College of Dentistry, Federal University of Ceara, Sobral, Ceara, Brazil.
2. Department of Dental Clinics, School of Pharmacy, Dentistry and Nursing, Federal University of Ceara, Fortaleza, Ceara, Brazil.
3. Department of Basic Science and Craniofacial Biology, College of Dentistry, New York University, New York, New York.