I was unable to find the number of currently active field missions for MSF, but I found information on the process of working for MSF. Each year they send about 2500 international aid workers (not just doctors) to many countries. These people are put alongside locally hired medical personnel to complete the missions. The process for becoming a volunteer is a bit long, with lots of requirements. Candidates need experience in their discipline, experience in management/ teaching, language skills, and previous experience in a humanitarian environment. From the film, it didn't seem that all the doctors had this experience, namely Davinder. MSF also likes that candidates have profficieny in French.
While looking at the FAQs on the US website, I found an interesting portion regarding care facilities and missions in Gaza, the West Bank, and Jerusalem. The MSF has a section defending their care in that area, but it is posed in the form of questions like "Why are you taking sides? You seem biased" or "Why are you getting involved in this but choose to stay neutral in other conflicts around the world?" It just strikes me as strangely unprofessional to have it phrased that way. The answers also seem very defensive in a reactionary manner. I just honestly thought it could have been phrased better or not included at all. It is information that maybe a few people might find useful, but would be better placed in a press release or answered by a recruiter.
I also learned that, interestingly enough, 90 percent of the medical professionals are local rather than international. They are trained by the international staff so as to provide a continuity of care. The film didn't really portray that fact, and made it seem like the clinic would have nearly no staff once the international doctors left.