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Sham JS, Wei WI, Zong YS, Choy D, Guo YQ, Luo Y, Lin ZX, Ng MH.Sham JS, et al. Among authors: choy d.Lancet. 1990 Feb 17;335(8686):371-4. doi: 10.1016/0140-6736(90)90206-k.Lancet. 1990.PMID: 1968116
Sham JS, Wei WI, Lau SK, Yau CC, Choy D.Sham JS, et al. Among authors: choy d.Head Neck. 1992 Jan-Feb;14(1):19-23. doi: 10.1002/hed.2880140105.Head Neck. 1992.PMID: 1624290
Wei WI, Sham JS, Zong YS, Choy D, Ng MH.Wei WI, et al. Among authors: choy d.Cancer. 1991 Jun 15;67(12):3127-30. doi: 10.1002/1097-0142(19910615)67:12<3127::aid-cncr2820671231>3.0.co;2-r.Cancer. 1991.PMID: 1646070
Sham JS, Wei WI, Nicholls J, Chan CW, Choy D.Sham JS, et al. Among authors: choy d.Cancer. 1992 Feb 15;69(4):854-9. doi: 10.1002/1097-0142(19920215)69:4<854::aid-cncr2820690403>3.0.co;2-q.Cancer. 1992.PMID: 1735076
Sham JS, Chan LC, Loke SL, Choy D.Sham JS, et al. Among authors: choy d.Oncology. 1991;48(6):480-2. doi: 10.1159/000226985.Oncology. 1991.PMID: 1749586
Sham JS, Choy D.Sham JS, et al. Among authors: choy d.Australas Radiol. 1991 Nov;35(4):370-3. doi: 10.1111/j.1440-1673.1991.tb03050.x.Australas Radiol. 1991.PMID: 1812832