its not supposedly, thats just how it is
Seriously, try to find B/As from any german surgeon online. I tried for 3 fuggin months
Do you reside outside of the EU? If that's the case then you have to seek out some of Z's patients and ask them individually.
So far I've only had luck with one but it was pretty amazing.. although I'm not exactly sure what he had done, apart from the chin wing, or if he had combined it with other surgeries with other plastic surgeons.