Perbandingan Akurasi Diagnostik Lingkar Paha, Lingkar Betis, Subjective Global Assessment, dan Kekuatan Genggam Tangan sebagai Penapis Sarkopenia pada Pasien Inflammatory Bowel Disease (IBD) = Diagnostic Accuracy Comparison of Thigh Circumference, Calf Circumference, Subjective Global Assessment and Handgrip Strength as a Screening Modality of Sarcopenia in Inflammatory Bowel Disease (IBD) Patient