1. Annica Tevell Åberg, PhD, is a Senior Researcher; Kristian Björnstad, PhD, is a Senior Researcher; and Mikael Hedeland, PhD, is an Associate Professor and Deputy Head of Department; all at the Department of Chemistry, Environment and Feed Hygiene, National Veterinary Institute (SVA), Uppsala, Sweden. Dr. Åberg and Dr. Hedeland are also affiliated with the Division of Analytical Pharmaceutical Chemistry, Uppsala University, Uppsala, Sweden.