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Guidelines for Field Surveys of the Quality of Medicines: A ProposalNewton, Paul N; Lee, Sue J; Goodman, Catherine; Fernández, Facundo M; Yeung, Shunmay; Phanouvong, Souly; Kaur, Harparkash; Amin, Abdinasir A; Whitty, Christopher J. M; Kokwaro, Gilbert O; Lindegårdh, Niklas; Lukulay, Patrick; White, Lisa J; Day, Nicholas P. J; Green, Michael D; White, Nicholas J · PLoS Medicine · 2009