Oral and maxillofacial surgery cases.
Oral and maxillofacial surgery clinics of North America.
Oral and maxillofacial surgery.
Oral health & preventive dentistry.
Oral health and dental management.
Oral microbiology and immunology.
Oral science international.
Oral surgery, oral medicine, oral pathology and oral radiology.
Oral surgery, oral medicine, oral pathology, oral radiology and endodontics.
Organic and medicinal chemistry letters.
Organisms, diversity, & evolution.
Organizational psychology review.
Oriental pharmacy and experimental medicine.
Origins of life and evolution of the biosphere.
ORL; journal for oto-rhino-laryngology and its borderlands.
Orphanet journal of rare diseases.
Orthodontics and craniofacial research.
Orthopaedic journal of sports medicine.
Orthopaedics & traumatology, surgery & research.
Orthopedic clinics of North America.
Orthopedic research and reviews.
Orthopedic trauma directions.
Osong public health and research perspectives.
Osteoarthritis and cartilage open.
Osteoarthritis and cartilage.
Osteopathic family physician.
Osteopathic medicine and primary care.
Osteoporosis and sarcopenia.
Osteoporosis international.
Osteosynthese international.
Osteosynthesis and trauma care.
OTA international : the open access journal of orthopaedic trauma.
OTJR : occupation, participation and health.
OTJR : Occupational therapy journal of research.
Otolaryngologic clinics of North America.
Otolaryngology case reports.
Otolaryngology--head and neck surgery.
Outcomes management for nursing practice.
Oxford medical case reports.
Oxford open digital health.
Oxford open infrastructure and health
Oxford open neuroscience.
P&T : a peer-reviewed journal for formulary management.
Pacific Rim international journal of nursing research.
Pacing and clinical electrophysiology : PACE.
Pädiatrie und pädologie.
Paediatric and neonatal pain.
Paediatric and perinatal epidemiology.