Because it is difficult to learn and not just medical knowledge only. But they must also have knowledge in subjects with such technology, physics, mathematics, and technology (C programming language).
Because it is difficult to learn, and not just the knowledge of the doctor. It also requires knowledge in subjects such as physics technology with mathematics. And Technology (programming language C).
Because it is study hard and not only use knowledge of medicine. But also need to have knowledge about technology, such as physics, mathematics, and Technology (programming language C).