In our twenty-fifth year as Editors of this Textbook, we extend

Abiding respect to our mentors who inspired us;

Deepest gratitude to our colleagues who assisted us;

Infinite love for our families who support us;

And unbridled hopes for our students who will succeed us.

Robert E. Hales, M.D., M.B.A.

Stuart C. Yudofsky, M.D.

Laura Weiss Roberts, M.D., M.A.