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Both are very regular posters on the mini-IVF forum and they are definitely not paid marketers, because they complain about NH's issues as well.
One of them mentioned that she met a patient at NH who was never able to retrieve any eggs for several cycles. Zhang charged her nothing, not even for the monitor and blood test which she was supposed to pay. Zhang felt bad about her case and decided that he would only charge when she could have something to retrieve.
Another woman was there banking embryos. She originally wanted to go on for another 3-cycle package, and Zhang told her that given her blast quality on ice, she should start the ET, so that she doesn't need to spend extra money on banking if she can find success earlier.
I also asked other NH patients (mainly older bankers) about what they think of Zhang and Chang's integrity, and have heard pretty positive things about them. They don't upsell you many packages, and if you are an old patient, you are grandfathered with the old price before their price hike, which sounds very reasonable to me.
Actually this is the first negative opinion about his integrity that I heard about, other than the chaos of the office which we all know about. If you suspect he cooks the book, you should definitely report him to SART or other regulatory boards, that will do lots of people a great service.