Pengaruh suplementasi probiotik terhadap perubahan frekuensi defekasi, kandungan asam butirat dan konsistensi feses, serta skor flatulensi pada pekerja kantor dengan penurunan frekuensi defekasi = Effect of probiotic supplementation on changes of frequency defecation, stool butyric acid content and consistency, and flatulence score among office and factory workers with decreased defecation frequency