Hello,
I need your help to correct following sentences:

To whom it may concern.

I confirm, that (names) is doing the survey by order of a project, situated at the Herder Institute of the University of Leipzig/Germany.
The data will be kept in confidence and will be analysed anonymously.
I appreciate your confidence in us.
If you have further questions do not hesitate to contact me.

Thank you very much!!!!
To whom it may concern.

This is to confirm that (name) is/are carrrying out a survey as part of a project for [name of department] at the Herder Institute of the University of Leipzig/Germany. The data gathered in this survey will be kept in confidence and will be analysed anonymously.
I would appreciate your willingness to contribute to this survey and can assure you that your contribution will be valued.
If you have further questions do not hesitate to contact me at the address given above.

Thank you very much.
Dear Feebs11,

Thank you very much for your help!!