Availability by phone**:
Monday - Saturday 07 a.m. - 10 p.m.
I will call back as soon as possible.
Your call is picked up by an external service provider
who processes Your data with privacy, in order to inform me (Dr. Daniel Birkfeld).
Your data is sent to me by SMS and by e-mail (unencrypted).
If You do not agree with this, please call me by my mobile directly.