Oliveira-Monteiro, Pedro, Clinical Hematology Department, Centro Hospitalar e Universitário São João, Porto, Portugal
Oliveira-Silva, Catarina, Department of Nephrology, Hospital de Braga, Braga, Portugal
Olivério, João
Olmati, Federica, Specialized Center of Secondary Hypertension, Department of Internal Medicine and Medical Specialties, University “Sapienza”, Rome
Olmesdahl, Nine-Paula, Division of Anatomical Pathology, Dept. of Pathology, National Health Laboratory Service and University of the Witwatersrand, Johannesburg, South Africa
Olmos, José M., Department of Internal Medicine, Hospital Universitario Marqués de Valdecilla-IDIVAL, Universidad de Cantabria, Santander, Spain
Olmos-Martínez, José M., Gastroenterology and Hepatology Department, Hospital Universitario Marqués de Valdecilla-IDIVAL, Universidad de Cantabria, Santander, Spain
Olson, Erik , Department of Gastroenterology, Rochester General Hospital, Rochester, New York, USA
Omar, Kacimi, Faculty of Medicine and Pharmacy, Casablanca, Hassan II University of Casablanca, Casablanca, Morocco; Emergency Department of Radiology, Ibn Rochd University Hospital Centre, Casablanca, Morocco
Onder, Graziano, Department of Geriatrics, Catholic University of Sacred Heart, A. Gemelli Polyclinic, Rome, Italy.

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