A new clustering model based on the seminal plasma/serum ratios of multiple trace element concentrations in male patients with subfertility by Takazo Tanaka, Kosuke Kojo, Yoshiyuki Nagumo, Atsushi Ikeda, Takuya Shimizu, Shunsuke Fujimoto, Toshiyuki Kakinuma, Masahiro Uchida, Tomokazu Kimura, Shuya Kandori, Hiromitsu Negoro, Hiroyuki Nishiyama

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