RT Journal Article SR Electronic T1 Development of Guidance Modules by the PDA To Extend and/or Eliminate Periodic Validation: A Proposal to PDA Scientific Advisory Board JF PDA Journal of Pharmaceutical Science and Technology JO PDA J Pharm Sci Technol FD Parenteral Drug Association (PDA) SP 245 OP 248 VO 57 IS 4 A1 Korczynski, Michael S. YR 2003 UL http://journal.pda.org/content/57/4/245.abstract AB