The effect of palm oil-derived tocotrienol-rich fraction in preserving normal retinal vascular diameter in streptozotocin-induced diabetic rats. - Abdul Ghani NA; Abdul Nasir NA; Lambuk L; Sadikan MZ; Agarwal R; Ramli N (Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie, 2023)