Minnesota doctors say health plan rules keep them from talking to patients. Others say the moves add to a shortage in care. Dr. Eric Larson calls himself a "conscientious objector." Six months ago, the Edina psychiatrist announced that he would no longer accept insurance payments. If his patients wanted to keep seeing him, they would have to pay his fee, in full, at the door. Cash and credit cards accepted. The change meant giving up a steady source of income. But for Larson, 48, it was a gamble worth taking. He's one of a small cadre of psychiatrists in Minnesota...