Forward-Looking Multimodal Endoscopic System Based on Optical Multispectral and High-Frequency Ultrasound Imaging Techniques for Tumor Detection. - Jihun Kim; Hah Min Lew; Jung-Hee Kim; Sangyeon Youn; Hasan Al Faruque; An Na Seo; Soo Yeun Park; Jin Ho Chang; Eunjoo Kim; Jae Youn Hwang (IEEE Trans. Medical Imaging, 2021)