Different social,.Races and backgrounds. May be a problem in a way. But the lack of communication with the issue of language. May lead to more misunderstandings. And affect long-term follow-up.
Social differences, Nationalities and backgrounds may be a problem but if lack of communication by language problems may cause more misunderstandings and impact in the long run.
The differences in society,race and background may be a problem, but if you want to communicate with the language problems may cause misunderstandings and more long-term impact.