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• Associations
  • General Medical Associations
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  • Orthopaedic Professional Organizations and Associations
  • Professional Associations
  • World Medical Associations & Societies

• Professional Associations

- O -

• OAA

Opticians Association of America



• OAM

Office of Alternative Medicine



• OASDHI

Old Age, Survivors, Disability, and Health Insurance



• OCA

Organization of Chinese Americans



• OCCAM

Office of Cancer Complementary and Alternative Medicine



• OCD

Office of Child Development
Office of Civil Defense



• OCHS

Office of Cooperative Health Statistics



• OCIS

Oncology Center Information System



• ODAC

Oncologic Drugs Advisory Committee (of the US Food and Drug Administration)



• ODSS

Office of Disability Support Services



• OGD

Office of Generic Drugs (of the Food and Drug Administration)



• OHTA

Office of Health Technology Assessment



• OIF

Osteogenesis Imperfecta Foundation



• OIG

Office of the Inspector General



• OME

Office of the Medical Examiner



• ONS

Office for National Statistics (United Kingdom)
Oncology Nursing Society



• OPD

Office of Orphan Products Development



• OPO

Organ Procurement Organization



• OPS

Ophthalmic Photographers Society



• OPSR

Office of Professional Standards Review



• OPST-BQA

Office of Professional Standards Review & Bureau of Quality Assurance



• OPTN

Organ Procurement and Transplantation Network



• ORLAU

Orthotic Research and Locomotor Assessment Unit



• ORNL

Oak Ridge National Laboratory



• OSEP

Office of Special Education Programs



• OSH

Office on Smoking and Health



• OSHA

Occupational Safety and Health Administration



• OTIS

Organization of Teratology Information Services



• OTOD

Organization of Teachers of Oral Diagnosis



• OTSG

Office of the Surgeon General



• OVR

Office of Vocational Rehabilitation



• OWL

Older Women's League