Wajanavisit, W. “Outcome of Early Hip Fracture Surgery in Elderly Patients in Ramathibodi Hospital: A Prospective Cohort Study”. Ramathibodi Medical Journal, vol. 36, no. 1, Mar. 2013, pp. 1-2, https://he02.tci-thaijo.org/index.php/ramajournal/article/view/102030.