Re: Histologic Evidence of New Collagen Formulation Using Platelet Rich Plasma in Skin Rejuvenation: A Prospective Controlled Clinical Study: Authors' Reply.

Dear Editor:

First of all, we thank the authors for their valuable contributions. We would like to respond to comments, respectively.

Firstly, there is not a standardized centrifugation protocol for preparing platelet rich plasma (PRP). Our tubes are centrifuged at 1,500 RPM.

Secondly, we are completely agreed that the efficiency of treatment depends on the platelet concentration in PRP. A sterfile Conformité Européenne (CE) marked RegenLab® kit (Regen Lab., Le Mont-sur-Lausanne, Switzerland) was used for preparation of PRP1. We are sorry that we did not perform a platelet count to our plasma samples.