Thoa C Nguyen, Dick J Witter, Ewald M Bronkhorst, Nhan B Truong and Nico HJ Creugers*
* Corresponding author: Nico HJ Creugers n.creugers@dent.umcn.nl
BMC Oral Health 2010, 10:2 doi:10.1186/1472-6831-10-2