In this case, a statement from

来源: 于 2005-11-09 14:08:55 [旧帖] [给我悄悄话] 本文已被阅读：次

the HR department of your company might also be needed. It should explain why your position is permanent and the number of people of your group.

P.S.: I am guessing you hold a PhD and works for a company.