[1] UNIV CALIF SAN DIEGO,DEPT MED,SAN DIEGO,CA 92103
[2] UNIV CALIF SAN DIEGO,DEPT NEUROSCI,SAN DIEGO,CA 92103
[3] DEPT VET AFFAIRS MED CTR,SAN DIEGO,CA
[4] INST NACL NUTR SALVADOR ZUBIRAN,DEPT BIOQUIM,MEXICO CITY 14000,DF,MEXICO
[5] INST MEXICANO SEGURO SOCIAL,CTR MED SIGLO XXI,DEPT INVEST CLIN NEUROL & NEUROCIRUGIA,MEXICO CITY,DF,MEXICO
[6] VANDERBILT UNIV,DEPT MED,NASHVILLE,TN