[1] Univ Valparaiso, Fac Dent, Valparaiso, Chile
[2] Kuwait Univ, Fac Dent, Safat, Kuwait
[3] Univ Hosp, Dept Oral & Maxillofacial Surg, Copenhagen, Denmark
[4] Loma Linda Univ, Sch Dent, Loma Linda, CA 92350 USA
[5] Karolinska Inst, Dept Pediat, Huddinge, Sweden
[6] Albert Einstein Med Ctr, Philadelphia, PA 19141 USA
[7] Hennepin Cty Med Ctr, Minneapolis, MN 55415 USA
[8] Univ Maryland, Baltimore, MD 21201 USA
[9] Univ N Carolina, Chapel Hill, NC USA
[10] Univ Bern, Bern, Switzerland