Johanna M. van Dongen Jantien van Berkel Cécile R.L. Boot Judith E. Bosmans Karin I. Proper Paulien M. Bongers Allard J. van der Beek Maurits W. van Tulder Marieke F. van Wier

Katherine Weare

DoHee Kim-Appel

Tom Fisher

Angela P. Harris

hojatollah yousefimanesh department of periodontology, school of dentistry, ahvaz jundishapur university of medical sciences, ahvaz, ir iran mansour amin health research institute, infectious and tropical diseases research center, ahvaz jundishapur university of medical sciences, ahvaz, ir iran; health research institute, infectious and tropical diseases research center, jundishapur university of medical sciences, ahvaz, ir iran. tel: +989166711679 maryam robati department of oral medicine, school of dentistry, ahvaz jundishapur university of medical sciences, ahvaz, ir iran hamed goodarzi infectious and tropical diseases research center, department of microbiology, school of medicine, ahvaz jundishapur university of medical sciences, ahvaz, ir iran masumeh otoufi department of periodontology, school of dentistry, ahvaz jundishapur university of medical sciences, ahvaz, ir iran

F. Nazari H. Mir Chamsy M. Bahmanyar

seyyed mansour seyyednejad department of biology, faculty of science, shahid chamran university, ahvaz, ir iran; department of biology, faculty of science, shahid chamran university, daneshgah sq., ahvaz, ir iran. tel/fax: +98-6113331045 hossein motamedi department of biology, faculty of science, shahid chamran university, ahvaz, ir iran mouzhan vafei department of biology, faculty of science, shahid chamran university, ahvaz, ir iran ameneh bakhtiari department of biology, faculty of science, shahid chamran university, ahvaz, ir iran