1 Radiation Medicine Centre, Bhabha Atomic Research Centre, Tata Memorial Hospital Annexe, Jerbai Wadia Road, Parel, Mumbai, Maharashtra, India, 400 012. Electronic address: drsanb@yahoo.com.
2 Division of Nuclear Medicine, Perelman School of Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA 19104, USA. Electronic address: abass.alavi@uphs.upenn.edu.