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Jokar, L.; Bayani, M.; Hamidi, H.; Keivan, M.; Azari-Marhabi, S. A Comparison of 940 Nm Diode Laser and Cryosurgery With Liquid Nitrogen in the Treatment of Gingival Physiologic Hyperpigmentation Using Split Mouth Technique: 12 Months Follow Up. J laser Med Sci 2019, 10, 131-138.