1. Institute of Modern Optics, Nankai University, Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin Key Laboratory of Micro‐scale Optical Information Science and Technology Tianjin 300350 China
2. Department of Oral Pathology, Tianjin Stomatological Hospital, Hospital of Stomatology Nankai University Tianjin 300041 China
3. Department of Oral Medicine, Tianjin Stomatological Hospital, Hospital of Stomatology Nankai University Tianjin 300041 China
4. Department of Oral‐Maxillofacial Surgery, Tianjin Stomatological Hospital; Hospital of Stomatology Nankai University Tianjin 300041 China