Serum Zinc and Selenium in Children with Inflammatory Bowel Disease: A Multicenter Study in Japan. - Ishihara J; Arai K; Kudo T; Nambu R; Tajiri H; Aomatsu T; Abe N; Kakiuchi T; Hashimoto K; Sogo T; Takahashi M; Etani Y; et al. (Digestive diseases and sciences, 2022)