“…According to the Korean Standard Classification of Diseases, Seventh Revision (KCD‐7), the diagnosis code of RD includes RA, osteoporosis, and OA (Appendix S1). Osteoporosis and OA are considered RDs in previous studies (Camafeita, Lamas, Calvo, Lopez, & Fernandez‐Gutierrez, ; Monjardino, Lucas, & Barros, ; Reis & Viana Queiroz, ; Toledano et al, ). Similar to other RDs, they are commonly characterized by metabolic pathologies such as alteration of osteoblast or vitamin D (Corrado, Maruotti, & Cantatore, ; Rossini et al, ).…”