Contribution to authorship
I.G.T.B., J.P.H., C.G.G. and R.P.Z. designed the study. R.H.M.V. and R.P.Z. performed all robotic surgeries. Data collection was carried out by J.P.H. and I.G.T.B. The statistical analysis was done by I.G.T.B. and the subsequent results interpreted by I.G.T.B., J.P.H., C.G.G. and R.P.Z. The manuscript was drafted by I.G.T.B., J.P.H. and C.G.G. , which was critically revised and approved by H.W.R.S., I.M.J.S., R.H.M.V. and R.P.Z.