[1] Medtronic, Spinal & Biol Div, Memphis, TN 38132 USA
[2] Univ Minnesota, Hard Tissue Lab, Minneapolis, MN 55455 USA
[3] Medtron World Headquarters, Minneapolis, MN 55432 USA
[4] Mannheimer Fdn, Homestead, FL 33034 USA
[5] Univ Texas Hlth Sci Ctr San Antonio, Dept Periodont, San Antonio, TX 78229 USA