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