A rare case of congenital red hair heterochromia of the scalp - Hua Yen Ling, MBBS, MRCP (UK); Sharon Mun Yee Wong, MBBS, MRCPCH (UK); Jinghui Yang, MBBS, MRCPCH (UK); Mark Jean Aan Koh, MBBS, MRCPCH (UK) (Elsevier, 2020)