M.V. Karpuj, M.W. Becher, J.E. Springer, D. Chabas, R. Pedotti, S. Youssef, D. Mitchell & L. Steinman Nature Med. 8, 143–149 (2002).

Page 143, the two URLs in Methods are incorrect. The correct URLs are given below.

http://rana.stanford.edu/software

http://waldo.wi.mit.edu/MPR/software.html