No I haven't, but I'll do some research on both and ask my doctor about both options. I wish she was more accessible. The net available appointmentment for her, which I have, is in January. I asked her office if she is healthy, and she said shes in good health. I then asked if they could give a referral and the place they reffered me to was out in Chelsea far away from Ann Arbor. She knows how important this is so she told me to see her in a month and she's making that impossible. Ill call the doctor's office again and hopefully the squeaky wheel gets the grease.