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Objective To observe the effect of full thickness lamellar keratoplasty combined with PTK ( photo therapeutic keratectomy ) .
目的探讨联合 PTK 的全厚植片深板层角膜移植术的疗效.
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All he needs to do is shell our $30 for paternity testing kit ( ' , PTK) at his local drugstore - and another $120 to get the results.
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