1. WHO (2002) Press release WHO/52 – 28 June 2002. World Health Organization, Geneva
2. Allen TM (2002) Nat Rev Cancer 2:750
3. Matsumura Y, Maeda H (1986) Cancer Res 46:6387
4. Iwai K, Maeda H, Konno T (1984) Cancer Res 44:2115
5. Maeda H, Matsumura Y (1989) Crit Rev Ther Drug Carrier Syst 6:193