The effect of zinc-containing calcium phosphate coating on the osseointegration of transcutaneous implants for limb prosthetics by Maksim V. Stogov, Andrey A. Emanov, Viktor P. Kuznetsov, Ekaterina G. Komarova, Elena N. Gorbach, Elena A. Kireeva, Tatiana V. Tolkacheva, Yurii P. Sharkeev