Thirteen studies provided data on nutritional status (See Additional file 2) [20, 27–30, 32, 34, 37, 38, 41, 42, 44, 48], most commonly using Body Mass Index (BMI) (n = 9) [20, 27, 29, 30, 32, 37, 38, 41, 42, 44], followed by the Mini Nutritional Assessment Short Form (n = 2) [28, 34], the Mini Nutritional Assessment (n = 1) [48], the Malnutrition Universal Screening Tool (n = 1) [20], unintentional weight loss (n = 1) [32] and a serum albumin test (n = 1) [34]. The gene discussed is ALB; the disease is nutritional deficiency disease.