Fig. 1From: Daylight photodynamic therapy versus cryosurgery for the treatment and prophylaxis of actinic keratoses of the face − protocol of a multicenter, prospective, randomized, controlled, two-armed studyPotential study patient. Face of a potential study participant with Glogau Photodamage Classification Type III (advanced). Multiple visible AK, sallow skin discoloration with teleangiectasias and wrinklesBack to article page