A randomised double-blind placebo-controlled clinical trial of oral hydroxyurea for transfusion-dependent β-thalassaemia oleh Nirmani Yasara, Nethmi Wickramarathne, Chamila Mettananda, Ishari Silva, Nizri Hameed, Kumari Attanayaka, Rexan Rodrigo, Nirmani Wickramasinghe, Lakshman Perera, Aresha Manamperi, Anuja Premawardhena, Sachith Mettananda