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I do have a green card since 2005. 2005-2008 I lived and worked in US. For the past year I was able to come to US only once, (because I have to be abroad to get medical treatment) - 6 month ago and stayed for 4 weeks. Will I have any problems entering US in the next 6 month after already been absent for 6 month? Do I need to have any papers showing that I was outside US for more than 6 month because of my medical treatment?