Fig. 3. Publication trend in specific areas of male infertility research over the past 20 years. (A) Publication trend of varicocele, azoospermia, oligozoospermia, testicular cancer, erectile dysfunction, and male genital tract infection by year from 1998–2017. (B) Publication trends of unexplained male infertility (UMI), hypogonadism, obesity and metabolic syndrome, lifestyle, and occupational exposure by year from 1998–2017.
