Portability of an algorithm to identify rheumatoid arthritis in electronic health records. - Robert J. Carroll; William K. Thompson; Anne E. Eyler; Arthur M. Mandelin; Tianxi Cai; Raquel M. Zink; Jennifer A. Pacheco; Chad S. Boomershine; Thomas A. Lasko; Hua Xu 001; Elizabeth W. Karlson; Raúl G. Pérez; et al. (J. Am. Medical Informatics Assoc., 2012)