1. Institute for Advanced Sustainability Studies, Potsdam, Germany
2. Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
3. Institute for Advanced Sustainability Studies, Potsdam, Germany; Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
4. College of Earth and Environment Sciences, Lanzhou University, Lanzhou, China
5. Gansu Provincial Maternity and Child-care Hospital, Lanzhou, China
6. Environment Protection and Resources Conservation Committee of the National People’s Congress of the People’s Republic of China, Beijing, China