I have seen at first hand recruiting teams from the NHS (and from other European countries) in action in The Gambia, offering wages which are not good by our standards but when expressed in the local currency seem like impossible riches to the Gambians. The cost of living in Europe is not expressed properly so the nurses leave - and deprive one of the poorest countries in the world of their much needed medical staff. These nurses have been trained at the expense of a third world country which no longer benefits from its investment in human resources.
The situation is worse with doctors in The Gambia. Most of them qualify in Europe, America and India. Very few return after qualification.
On my regular visits to The Gambia over the years, I have had occasion to go to the M.R.C. (Medical Research Centre) on a number of occasions. Each time I have been seen by a Cuban doctor. I asked why all the doctors in the Gambia seem to be Cuban. The answer runs something like this -
When you go for an interview for a doctor's post in Cuba, the questions that the interview panel will ask you will always be the same and one will be 'where have you worked since qualifying?' If the answer does not include at least 3 years in a third-world country then you can forget a doctor's job in Cuba.

But then the Cubans are communists and don't have the enlightened thinking of Western European governments.