It is not easy for a doctor to write a book, but it is very common for a senior doctor to write a book.
In China, the cost of publishing a book is mainly concentrated in three aspects: content, cost and sales.
The content is easy to understand. There is always something to write in a book. If you don’t want to be picked on later, you have to write something that no one else has written, even if it is rubbish that no one else has written.
The cost of publishing and the sales could be seen as one. Because many books, especially academic monographs, were so difficult to sell that unless the publisher paid for it himself, the publishing house would not give it to the publisher at all.