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You can look up reviews for the Germans on jameda, and there are some on Google as well. The problem with jameda is that they make it hard to post bad reviews, so keep in mind that you’re probably not seeing the whole picture. However, their top hernia surgeons do have many excellent and detailed reviews, and they are pleasant people. I talked to a few of them, and almost went there.
Dr. Kang may be a good choice. There’s less information available out there from patients since he’s in Korea.
How did Carvajal diagnose your direct hernia before surgery? Was he able to palpate it?