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Number of publications per year on the topic of superparamagnetic iron oxide with biological and medical applications between 2000 and 2019. (A) Values obtained using the Web of Science database (total counts per search – blue: 9575, orange: 1099, green: 966). (B) Values obtained using Medline (PubMed) trendline count (total counts per search – blue: 5610, orange: 4436, green: 744).
