I contacted their hospital from official website. Pa3 has a marketing department in Shenzhen, China. Before that, I wondered if the people there were intermediaries. Facts have proved that this is not the case. They are directly connected to the hospital and belong to the hospital. If you are not sure, you can go to official website for consultation. I really don't trust. I can also go to the marketing department to check. My husband and I have also checked before.