Relationship of skin complexion with gingival tissue color and hyperpigmentation. A multi-ethnic comparative study oleh Pradeep Koppolu, Haifa Almutairi, Safa al Yousef, Nisren Ansary, Mohammed Noushad, Mantri Bharath Vishal, Lingam Amara Swapna, Nouf Alsuwayyigh, Malak Albalawi, Deepti Shrivastava, Kumar Chandan Srivastava