Joining as a Medical doctor in Tehran?

Assalam O Alaikum,

My post is regarding medical profession.
What is the procedure if one person who is a simple MBBS doctor living in Pakistan is supposed to shift in Tehran and wants to join any Hospital as a medical doctor.

then is there any requirement or has he or she requires to clear any test to be able to work their legally...???

Kindly, if any body know about it can email or post a reply ...

Regards,
Muhammad Haris
email: harisgul88@yahoo.com