Watch rising stars in digital health and med-tech compete for $40,000 in prizes plus in-kind support. Four dozen teams, each with an idea of how to address one of four big needs in healthcare, were born at the OHSU Invent-a-thon last October. Over half are still developing the ideas that emerged that weekend, many in accelerators or connected to advisors met at Invent-a-thon. Six months later, the most investment-ready teams will return to the virtual stage to share their vision…