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Obesity
Obesity Research & Clinical Practice
Obesity Reviews
Obstetrics & Gynecology
Obstetrics and Gynecology
Occupational and Environmental Medicine
Oceanography
Oecologia
Oikos
Oncogene
Oncogenesis
OncoImmunology
Oncotarget
One Earth
Open Biology
Open Heart
Operative Neurosurgery
Ophthalmology
Optica
Optical Materials Express
Optics and Lasers in Engineering
Optics Express
Optics Letters
Optometry and Vision Science
Organic Letters
Organic Process Research & Development
Organization Science
Organization Studies
Organizational Behavior and Human Decision Processes
Oryx
Osteoporosis International
Oxford Economic Papers
Oxford Journal of Archaeology