只要获得其中一个学位，牙医就有资格从事于牙医业的普通全科。
Armed with either degree, a dentist can become certified to engage in the general practice of dentistry.
合格的受试者，普通执业医师(全科医师)随机化设计，通过个人邮件邀请。组2和组3中无应答者在12个月和24个月时候被重新邀请。
Eligible subjects, randomized within GP, were mailed a personal invitation. Nonresponders in groups 2 and 3 were invited again at 12 and 24 months.
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