Protein-Energy Malnutrition; Public Health and International Nutrition; Nutrition and Oral Health; Sub-cellular Effects of Nutrients; Nutrients and Gene Expression; Nitrogen Metabolism in Sickle Cell Disease; HIV Infection and Nutritional Status; Nutrition and Cancer; Free Radical Damage and Antioxidant Nutrients; Salivary Gland Function in Health and Malnutrition: Effects of nutrient deficiencies on muscarinic-cholinergic and ?-adrenergic receptor functions/activities; Acute Necrotizing Gingivitis and Infective Oral Necrosis (NOMA/CANCRUM ORIS) in Deprived Children in the Third World