RT Journal Article SR Electronic T1 Viral Clearance of Traditional Unit Operations: Virus-Retentive Filtration JF PDA Journal of Pharmaceutical Science and Technology JO PDA J Pharm Sci Technol FD Parenteral Drug Association (PDA) SP 142 OP 153 DO 10.5731/pdajpst.2015.01038 VO 69 IS 1 A1 Qi Chen A1 Dayue Chen YR 2015 UL http://journal.pda.org/content/69/1/142.abstract AB