Ten years after the bloody Brookline clinic attacks, one doctor explains why she still performs abortions.Ten years ago this month, John Salvi sprayed bullets into two Brookline abortion clinics, killing two people and wounding five. Since then, the number of doctors willing to perform abortions has dwindled, increasing the workload for those remaining. One local obstetrician and gynecologist, whose clinic asked that she withhold her name for safety reasons, now performs as many as 10 abortions a day, twice a week. One morning years ago, when I was working as a resident, a nurse brought me in to talk to...