Oh no. I am so very, VERY sorry to read this. How heartbreaking.. I can literally feel your panic, your heart pounding.
Nor do I have the info you seek, but I'm sure someone will pop up soon enough. P_RN supplied a good link, there will be others. I'm sure you could Google it as well, and find many links there.
I just want you to know that we are here embracing you gently, and that we all wish the best possible outcome for your son.
We are pulling for him, and wishing you strength, wisdom, and guidance.
I hope you find the answers to your questions.