Miguel Sousa Ferro, Professor at the Lisbon University Law School. Managing Partner at Sousa Ferro & Associados, Lisbon, Portugal. For correspondence: <mailto:miguelferro@fd.ulisboa.pt>. Ana Rita Calmeiro, Senior Associate at Sousa Ferro & Associados, Lisbon, Portugal. For correspondence: <mailto:anarita.barroca@sousaferro.pt>.