1. Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark
2. Laboratory for Integrative Studies in Amphibian Biology, Molecular Toxicology, Group in Endocrinology, Energy and Resources Group, Museum of Vertebrate Zoology, and Department of Integrative Biology, University of California, Berkeley, California 94720, United States
3. Department of Environmental and Civil Engineering, University of California, Berkeley, California 94720, United States
4. Department of Environmental Science, Aarhus University, 4000 Roskilde, Denmark