I'm preparing to leave for China for a work. I've been processing my documents. Do I need to authenticate my passport,medical certificates (form from Chinese embassy with certification and sealed in a Phil. hospital where I had my medical exams.)The company that hires me will send me my LOI (letter of invitation).Should I send to the company my documents or I will submit here with the LOI? How many days will it take to finish processing from today?Thank you very much!