Lifespan theorem for constrained surface diffusion flows

We consider closed immersed hypersurfaces in R^3 and R^4 evolving by a class of constrained surface diffusion flows. Our result, similar to earlier results for the Willmore flow, gives both a positive lower bound on the time for which a smooth solution exists and a small upper bound on a power of the total curvature during this time. By phrasing the theorem in terms of concentration of curvature in the initial surface, our result holds for very general initial data and has applications to further development in asymptotic analysis for these flows.