Collagenogenesis in Wounds After Skin Cryodestruction and Introduction of Cryopreserved Cord Blood Serum and Placenta Extract von Kovalov, Gennadiy A., Ischenko, Iryna O., Naumova, Olga V., Dedukh, Ninel V., Olefirenko, Aleksey A., Sandomirskiy, Boris P.