RT Journal Article SR Electronic T1 Product Sampling—Why Bother? JF PDA Journal of Pharmaceutical Science and Technology JO PDA J Pharm Sci Technol FD Parenteral Drug Association (PDA) SP 51 OP 55 VO 45 IS 1 A1 Schwemer, William S. YR 1991 UL http://journal.pda.org/content/45/1/51.abstract AB