Photodynamic therapy using topical methyl 5-aminolevulinate compared with cryotherapy for actinic keratosis: A prospective, randomized study von Szeimiesa, R.M., Karrera, S., Radakovic-Fijanb, S., Tanewb, A., Calzavara-Pintonc, P.G., Zanec, C., Sidoroffd, A., Hempele, M., Ulrichf, J., Proebstleg, T., Mefferth, H., Mulderi, M., Salomonj, D., Dittmark, H.C., Bauerl, J.W., Kernlandm, K., Braathenm, L.

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