1. Department of Microbiology and Parasitology, CIBUS-Faculty of Biology, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
2. Division of Oral Diseases, Department of Dental Medicine, Karolinska Institutet, Huddinge, Sweden
3. Division of cariology and endodontics, University Clinics of Dental Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland
4. Division of Endodontics, Department of Odontology, Umeå University, Umeå, Sweden