Dr. Saurabh Sharma,Dr. Manaswini Rathore,Dr. Ashutosh Sharma,Dr. Anita Sharma. IRREGULAR & LOSS OF FOLLOW UP AMONG INJECTING DRUG USERS ATTENDING AT OPIOID SUBSTITUTION THERAPY (OST) CENTER KOTA, RAJASTHAN: A CROSS SECTIONAL STUDY. IJPRT 2025, 15, 1622-1633.