However, as a single data point, it is rather non-instructive. What would be of interest is the same method being applied to other countries, and then see those results.
That would be informative. Study is dated 2006 (6 years ago) and I wonder if changes have happened now? Does the area of Mexico a doctor practices in matter (my guess is yes)? Those that target medical tourism I would suggest are every bit as capable as those in first world countries.