Advanced Oncotherapy PLC - AVO

Advanced Oncotherapy are really pioneering the light proton beam technology used to treat cancer without damaging surrounding organs. Read this recent article about itโ€™s latest success:

They have a new practice being built in London that will be ready in 2020 and will start serving patients. Now is a very good time to invest.

Would be very keen for this to be added!

Are there criteria for these AIM stocks to be added?