I have list with doctors sorted by country. When a user chooses "Germany" they will see doctors from Germany. When that happens, I change URL e.g. 'example.com/list?=germany' but I do not change <title> of the page. The title for "Germany" is same as the whole list or as it is for doctors from Italy.

Is this fine or do I need have special <title> for each choice? Will Google think that using the same title indicates thin content or spam?