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The authors achieved excellent results using argon laser treatment of PWS in 45% of 84 patients. Punch biopsies were taken preoperatively in all patients. Their classification according to fullness of erythrocytes of the vessels was found to be of relative value in predicting the treatment result. It is thus found to be advisable to administer a test treatment of a limited area in all patients.
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Malm et al. (1988) studied this question.
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