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Rank Category Total Articles Total Journals
1 Oncology 1230945 291
2 Optics 599853 101
3 Obstetrics & Gynecology 506161 97
4 Orthopedics 414026 104
5 Ophthalmology 384808 77
6 Operations Research & Management Science 231610 89
7 Otorhinolaryngology 223872 53
8 Oceanography 201519 77
9 Ornithology 46665 17
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