SAN FRANCISCO (KGO) -- A group of 30 UCSF medical professionals has published an open letter, calling for California schools to be reopened by February 1. Dr. Jeanne Noble, the Director of COVID response and Professor of Emergency Medicine at UCSF, is the lead author. "We don't have much time. Our kids have been out of school for a long time and they are suffering," Noble told ABC7 News. Her main argument points to data showing distance learning has led to mental health issues, especially to teenagers. "We need to realize that closing schools has real measurable impact. It's not just, 'we can do this to help COVID numbers.' It's harming kids."