Y. Chiew, S. Tan, B. Ahmad, S. E. Khor, and K. Abdul Kadir, “Tocotrienol-rich vitamin E from palm oil (Tocovid) and its effects in diabetes and diabetic retinopathy: a pilot phase II clinical trial”, ASJOO, vol. 17, no. 4, pp. 375-399, Apr. 2021.