Zhang, Q., Jing, Q., Gerritsen, A. E., Witter, D. J., Bronkhorst, E. M., & Creugers, N. H. J. (2015). Dental status of an institutionalized elderly population of 60 years and over in Qingdao, China. Clin Oral Investig.

Zhang, Qian, Qian Jing, Anneloes E. Gerritsen, Dick J. Witter, Ewald M. Bronkhorst, e Nico H. J. Creugers. "Dental Status of an Institutionalized Elderly Population of 60 years and Over in Qingdao, China." Clin Oral Investig 2015.

Zhang, Qian, et al. "Dental Status of an Institutionalized Elderly Population of 60 years and Over in Qingdao, China." Clin Oral Investig 2015.