1. Hacettepe University, Chemical Engineering Department and Bioengineering Division, P.K. 716 Kizilay, Ankara, Turkey
2. Ankara University, Ibni Sina Hospital, Department of Radiology, Ankara, Turkey
3. Hacettepe University, Department of Chemistry, Biochemistry Division, Ankara, Turkey
4. Chinese Academy of Sciences, Chengdu Institute of Biology, Chengdu, Schiuan, PRC