You are Permanent Resident of other country (Like Canada, France, UK), But you still need to write to Department of State to get a ADVISORY LETTER indicates that you are not subject to J1 two year home residence.
You are subject to J1 waiver if:
1. you are chinese (skill list between US and China)
2. you use Goverment money either from US or China
3. you get medical trainning in US
You are subject to J1 waiver if:
1. you are chinese (skill list between US and China)
2. you use Goverment money either from US or China
3. you get medical trainning in US