M.S.
Hi D.,
I got to Harvard Vanguard on 129 in Chelmsford and HIGHLY reccomend them. My son's pediatrician is Dr David Solomon (SP?)and he has been fabulous with him. I have always had an easy time getting in to see them, usually within hours. The facility also has a LAB, and x-ray/ultrasound all in the same building, so it is pretty convenient.
Good luck!