The present commentary is based on the following considerations: 1) for the purposes of authorisation. a distinction is drawn between "research" and "intervention". The procedures for authorising the former are more complex. the relevant controls are stricter and approval has to be granted by a Research Ethics Committee (REC); 2) although the debate is still open. https://countryscenesaddleryandpetsuppliers.shop/product-category/pre-oiled-stitched-back-billet/