Digestive;
Service,;
University;
Hospital;
of;
Fuenlabrada,;
Fuenlabrada,;
Madrid;
28942,;
Spain;
Digestive;
Service,;
University;
Hospital;
Miguel;
Servet,;
Zaragoza;
50009,;
Spain;
消化系统疾病; 缺铁性贫血; 诊断工具; 缺铁症; 转铁蛋白受体; 血清学检查; 非甾体抗炎药; 身份证;