Optimization of micelle-encapsulated extremely small sized iron oxide nanoparticles as a T1 contrast imaging agent: biodistribution and safety profile oleh Minseok Suh, Ji Yong Park, Guen Bae Ko, Ji Yoon Kim, Do Won Hwang, Louis Rees, Gillian E Conway, Shareen H Doak, Hyelim Kang, Nohyun Lee, Taeghwan Hyeon, Yun-Sang Lee, Dong Soo Lee