Ng, C. S.; Lau, R. W.; Wong, R. H.; Yim, A. P. (2013). „Evolving Techniques of Endoscopic Thoracic Sympathectomy: Smaller Incisions or Less?”. The Surgeon. 11 (5): 290—291. PMID23891103. doi:10.1016/j.surge.2013.06.006.
Ng, C. S.; Lau, R. W.; Wong, R. H.; Yim, A. P. (2013). „Evolving Techniques of Endoscopic Thoracic Sympathectomy: Smaller Incisions or Less?”. The Surgeon. 11 (5): 290—291. PMID23891103. doi:10.1016/j.surge.2013.06.006.