1. Genetics Unit (L.M.W., F.R., F.H.G.), Shriners Hospital for Children, Montréal, Québec, Canada H3G 1A6;
2. Children's Hospital of Eastern Ontario (L.M.W.), University of Ottawa, Ottawa, Ontario, Canada K1H 8L1;
3. Shriners Hospital for Children (M.P.W.), St. Louis, MO 63131;
4. Shriners Hospital for Children (J.D.), Salt Lake City, Utah 84103;
5. Shriners Hospital for Children (P.E.G., R.E.M., T.A.P.), Shreveport, Louisiana 71103;
6. Shriners Hospital for Children (D.G.), Tampa, Florida 33612;
7. Shriners Hospital for Children (E.L.L.), Spokane, Washington 99204;
8. Shriners Hospital for Children (J.O.S.), Erie, Pennsylvania 16505;
9. Shriners Hospital for Children (P.A.S.), Chicago, Illinois 60707;
10. Shriners Hospital for Children (R.D.S.), Portland, Oregon 97239;
11. Shriners Hospital for Children (E.S.), Houston, Texas 77030;
12. Shriners Hospital for Children (G.T.), Los Angeles, California 90020;
13. Shriners Hospital for Children (D.L.S.-W.), Twin Cities, Minneapolis, Minnesota 55414;
14. Merck & Co. Inc. (N.V., N.H., A.L.), Whitehouse Station, New Jersey 08889