Lasse Dam Rasmussen, Birgit Kristensen, Carsten Kirkeby, Thomas Bruun Rasmussen, Graham J. Belsham, René Bødker, and Anette Bøtner
Author affiliations: Technical University of Denmark, Kalvehave, Denmark (L.D. Rasmussen, T.B. Rasmussen, G.J. Belsham, A. Bøtner); Technical University of Denmark, Copenhagen, Denmark (B. Kristensen, C. Kirkeby, R. Bødker)
The opinions expressed by authors contributing to this journal do not necessarily reflect the opinions of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.