Front. med. Front. med. Indications and hemoglobin thresholds for red blood cell transfusion and iron replacement in adults with gastrointestinal bleeding: An algorithm proposed by gastroenterologists and patient blood management experts Montoro Miguel Universidad de Zaragoza Cucala Mercedes Lanas Ángel Universidad de Zaragoza Villanueva Cándido Hervás Antonio José Alcedo Javier Gisbert Javier P. Aisa Ángeles P. Bujanda Luis Calvet Xavier Mearin Fermín Murcia Óscar Canelles Pilar García López Santiago Universidad de Zaragoza Martín de Argila Carlos Planella Montserrat Quintana Manuel Jericó Carlos García Erce José Antonio 2022 research-article