[1] Stanford Univ, Dept Pathol, Med Ctr, Sch Med, Stanford, CA 94305 USA
[2] Assoc Mol Pathol AMP, Clin Practice Comm, Chantilly, VA USA
[3] Quest Diagnost Nichols Inst, Chantilly, VA USA
[4] Univ Penn, Dept Pathol & Lab Med, Philadelphia, PA 19104 USA
[5] Brigham & Womens Hosp, Dept Pathol, Boston, MA 02115 USA
[6] Genzyme Corp, Mol Diagnost Lab, Westborough, MA USA
[7] Univ Hosp Cleveland, Ctr Human Genet Lab, Case Med Ctr, Cleveland, OH 44106 USA
[8] Stanford Univ, Dept Pediat, Sch Med, Stanford, CA 94305 USA