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Chang CH, Tsai PY, Yu CH, Ko HC, Chang FM.Chang CH, et al. Among authors: ko hc.Ultrasound Med Biol. 2007 Mar;33(3):335-41. doi: 10.1016/j.ultrasmedbio.2006.10.013.Ultrasound Med Biol. 2007.PMID: 17276579
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Chang CH, Yu CH, Chang FM, Ko HC, Chen HY.Chang CH, et al. Among authors: ko hc.Ultrasound Med Biol. 2002 Nov-Dec;28(11-12):1383-7. doi: 10.1016/s0301-5629(02)00650-6.Ultrasound Med Biol. 2002.PMID: 12498932
Yu CH, Chang CH, Ko HC, Chen WC, Chang FM.Yu CH, et al. Among authors: ko hc.Ultrasound Med Biol. 2003 Jan;29(1):19-23. doi: 10.1016/s0301-5629(02)00695-6.Ultrasound Med Biol. 2003.PMID: 12604113
Chang CH, Yu CH, Chang FM, Ko HC, Chen HY.Chang CH, et al. Among authors: ko hc.Ultrasound Med Biol. 2003 Mar;29(3):361-6. doi: 10.1016/s0301-5629(02)00732-9.Ultrasound Med Biol. 2003.PMID: 12706186
Chang CH, Yu CH, Ko HC, Chen WC, Chang FM.Chang CH, et al. Among authors: ko hc.Ultrasound Med Biol. 2003 Jul;29(7):929-33. doi: 10.1016/s0301-5629(03)00886-x.Ultrasound Med Biol. 2003.PMID: 12878237