Thangnapakorn, O., S. Wongwaisayawan, P. Lertsithichai, and S. Rattanasiri. “Occult Metastases in Negative Sentinel Lymph Node of Invasive Breast Cancer Discovered by Serial Section in Ramathibodi Hospital”. Ramathibodi Medical Journal, vol. 32, no. 2, June 2009, pp. 69-75, https://he02.tci-thaijo.org/index.php/ramajournal/article/view/175193.