This work was supported by U. S. Public Health Service grants 40899 and DA 10044 (to A.A.F., P.B.A., and P.G.), the Swedish Medical Research Council (to P.S. and B.B.F.), the Swedish Society for Medical Research (to P.S. and M.L.), Åke Wibergs Stiftelse (to P.S. and G.F.), Stiftelsen Lars Hiertas Minne (to P.S.), and Harald Jeanssons samt Harald och Greta Jeanssons Stiftelse (to G.F.).

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