Segmenting Skin Biopsy Images with Coarse and Sparse Annotations using U-Net. - Shima Nofallah; Mojgan Mokhtari; Wenjun Wu; Sachin Mehta; Stevan Knezevich; Caitlin J. May; Oliver Chang; Annie C. Lee; Joann G. Elmore; Linda G. Shapiro (J. Digit. Imaging, 2022)