25 Pages 1 Faculty of Pharmacy, Rhodes University, Grahamstown, Makhanda 6139, South Africa 2 Frazer Institute, Faculty of Health, Medicine and Behavioural Sciences, The University of Queensland, Brisbane, QLD 4102, Australia 3 School of Pharmacy and Pharmaceutical Sciences, The University of Queensland, Brisbane, QLD 4102, Australia 4 University of California, San Francisco, CA 94115, USA Keywords: topical delivery; skin pharmacokinetics; partition coefficient; in-use conditions;...