Sincere appreciation is expressed to Hans Langsjoen of the University of Texas Medical Branch at Galveston, Karl Folkers and Richard Willis of the University of Texas at Austin, Frederick Crane of Purdue University in Indiana, Lars Ernster of the Stockholm University, Sweden, Gian Paolo Littarru, of the University of Ancona Medical School, Italy, and my wife Alena Langsjoen for their help in the completion of this manuscript.
Peter H. Langsjoen, M.D., F.A.C.C.,P.A. 1120 Medical Dr. Tyler, Tx 75701