We would like to take this opportunity to express our gratitude to Mrs Nikki Jahnke, Managing Editor at the Cochrane Cystic Fibrosis and Genetic Disorders (CFGD) Group who supported us throughout this work. We are thankful for her inspiring guidance, and friendly advice on writing this review. We thank Dr. Soe Moe, Community Medicine Department, Melaka Manipal Medical College for her contribution in previous version of the review. We also would also like to express our warm thanks to Professor Jaspal Singh Sahota, Chief Executive of Melaka Manipal Medical College and Professor Adinegara Lutfi Abas, Dean of Faculty of Medicine, Melaka Manipal Medical College, for their support in writing this review.

This project was supported by the National Institute for Health Research, via Cochrane Infrastructure funding to the Cochrane Cystic Fibrosis and Genetic Disorders Group. The views and opinions expressed therein are those of the authors and do not necessarily reflect those of the Systematic Reviews Programme, NIHR, NHS or the Department of Health.