Growth Hormone treatment

Hi, my son has been on a growth hormone treatment for over a year now in London.
He was diagnosed and been seen by Prof Dattani in Great Ormond Street hospital in London.
we are moving back to Israel and I wanted to know what do I need to do to get the treatment going in Israel. who do I need to contact? how much does it cost? where is the best place to go?
I do have all the paperwork of his tests and results (MRI etc)

Thanks in advance,
Dganit