Author's response to letter to the editor regarding JHAM Kaanders et al. "Advances in cancer imaging require renewed radiotherapy dose and target volume concepts". (January 2021) - Kaanders, Johannes H.A.M.; van den Bosch, Sven; Dijkema, Tim; Al-Mamgani, Abrahim; Raaijmakers, Cornelis P.J.; Vogel, Wouter V.