[1] GOTHENBURG UNIV, FAC ODONTOL, DEPT ENDODONTOL & ORAL DIAGNOSIS, S-41390 GOTHENBURG, SWEDEN
[2] GOTHENBURG UNIV, FAC ODONTOL, DEPT PEDODONT, S-41390 GOTHENBURG, SWEDEN
[3] UNIV GOTHENBURG, DEPT SOCIAL WORK, GOTHENBURG, SWEDEN
[4] PUBL DENT HLTH SERV, GOTHENBURG, SWEDEN