Twitter-icon.com has a great selection of twitter icons and buttons.
Site: cvoi.org (CardioVasculair Onderwijs Instituut (CVOI))
Is opgericht op 28-01-1994 door de Nederlandse Vereniging Voor Cardiologie (NVVC), het Interuniversitair Cardiologisch Instituut Nederland (ICIN) en de Nederlandse Hartstichting (NHS).
Do you have a twitter account? If so it's important
to get as many people as possible to follow you.
Great follow me icon captures attention of the visitors
and brings more followers to your twitter account.
Choose great twitter icon for you website!