The invitation to edit this book came from Dr. E. Edward Bittar, an excellent colleague and friend. Along with the invitation came exceedingly useful suggestions on the contents and format, for which Dr. Bittar is to be amply credited, as well as for his mentoring this author and advising on steps to move the book along during difficult periods. This preface is the only place in which the Editors seemingly can thank the authors in public for the time and dedication they have spent for this volume
