This series of videos has been produced with the input from a group of medical students. We would like to express our sincere thanks towards the contributions made by Mr Lui Man Hin (Medic 17), Mr Lam Wai Yiu (Medic 16), Mr Lam Jason (Medic 16), Ms Chan Ho Yan (Medic 16) and Mr Cheung Pak Long (Medic 16) in the implementation of the project.