5 1 20 William J. Willams Primary Author Ernest Beutler Primary Author mixed material 0071003673 Robert S. Hillman Primary Author Kenneth A. Ault Primary Author mixed material 0071375023 Ernest Beutler Primary Author Marshall A. Lichtman Primary Author mixed material 0070703973 Robert I. Handin, MD Primary Author Samuel E. Lux Additional Author Thomas P. Stossel Additional Author mixed material 0781719933 Beck William S. Additional Author mixed material 0262021246