Does the quality of pain relief after major surgery influence the risk of postoperative complications? A prospective observational study - Christine Kubulus; Marcus Komann; Markus Paxian; Ann-Kristin Schubert; Daniel Schwarzkopf; Norman Rose; Winfried Meissner; Ursula Marschall; Johannes Dreiling; Carolin Fleischmann-Struzek; Thomas Volk (PLoS ONE, 2025)