This is an abstract that has been published online before the print version. I cannot find the full article yet.
This is a study of facial feminization of the forehead done on 172 patients over a four year period (2008-2012). It describes surgical techniques. They analyzed the results in terms of how the foreheads had changed. They also surveyed the patients on their satisfaction. The results are not actually given in the abstract.
The study seems to have been done by the people who did the surgery.