Usually, I don’t recommend a cover letter. Most of the individuals who review curricula vitae do not have the time to review more than the curricula vitae. The only time I would recommend a cover letter is if you have something to feature about yourself which isn’t in your curriculum vitae.
I can’t provide you with a sample cover letter as it has to be specific to you but what follows is a sample of a cover letter minus your specifics. It might be helpful to include your philosophy of practice and goals, if you know enough about the practice that you’re sure they’re a match with it.
Name and Address to whom you are sending the letter
I would very much like to learn more about your practice opportunity, to include your needs and the goals of the opportunity. I am certain I have the background and commitment to fill this position.
Body of the letter specific to your skills, experience, training, etc.
Thank you for your kind consideration. I look forward to hearing from you.