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Tan EH, Chua ET, Wee J, Tan T, Fong KW, Ang PT, Lee KS, Lee KM, Khoo-Tan HS, Leong SS, Ong YK, Foo KF, Sethi VK, Chua EJ.Tan EH, et al. Among authors: leong ss.Int J Radiat Oncol Biol Phys. 1999 Oct 1;45(3):597-601. doi: 10.1016/s0360-3016(99)00210-2.Int J Radiat Oncol Biol Phys. 1999.PMID: 10524411