Is there the same requirement to obtain the PhD degree in all the departments of surgery of the Spanish universities? Xavier Serra-Aracil; Manel Armengol Carrasco; Joan Morote Robles; Eloy Espin Basany; Natalia Amat-Lefort; Álvaro Serra-Gómez; Salvador Navarro-Soto;

Combined endoscopic and laparoscopic surgery for the treatment of complex benign colonic polyps (CELS): Observational study Xavier Serra-Aracil; Esther Gil-Barrionuevo; Eva Martinez; Laura Mora-López; Anna Pallisera-Lloveras; Sheila Serra-Pla; Valenti Puig-Divi; Salvador Navarro-Soto;