PT - JOURNAL ARTICLE AU - Michael S. Korczynski TI - Development of Guidance Modules by the PDA To Extend and/or Eliminate Periodic Validation: A Proposal to PDA Scientific Advisory Board DP - 2003 Jul 01 TA - PDA Journal of Pharmaceutical Science and Technology PG - 245--248 VI - 57 IP - 4 4099 - http://journal.pda.org/content/57/4/245.short 4100 - http://journal.pda.org/content/57/4/245.full SO - PDA J Pharm Sci Technol2003 Jul 01; 57