­­Eleven tips for operational researchers working with health programmes: our experience based on implementing differentiated tuberculosis care in south India by Hemant Deepak Shewade, Asha Frederick, Madhanraj Kalyanasundaram, Joshua Chadwick, G. Kiruthika, T. Daniel Rajasekar, K. Gayathri, R. Vijayaprabha, R. Sabarinathan, Shri Vijay Bala Yogendra Shivakumar, Kathiresan Jeyashree, P. K. Bhavani, S. Aarthi, K. V. Suma, Delphina Peter Pathinathan, Raghavan Parthasarathy, M. Bhavani Nivetha, Jerome G. Thampi, Deiveegan Chidambaram, Tarun Bhatnagar, S. Lokesh, Shanmugasundaram Devika, Timothy S. Laux, Stalin Viswanathan, R. Sridhar, K. Krishnamoorthy, M. Sakthivel, S. Karunakaran, S. Rajkumar, M. Ramachandran, K. D. Kanagaraj, M. Kaleeswari, V. P. Durai, R. Saravanan, A. Sugantha, S. Zufire Hassan Mohamed Khan, P. Sangeetha, R. Vasudevan, R. Nedunchezhian, M. Sankari, N. Jeevanandam, S. Ganapathy, V. Rajasekaran, T. Mathavi, A. R. Rajaprakash, Lakshmi Murali, U. Pugal, K. Sundaralingam, S. Savithri, S. Vellasamy, D. Dheenadayal, P. Ashok, K. Jayasree, R. Sudhakar, K. P. Rajan, N. Tharageshwari, D. Chokkalingam, S. M. Anandrajkumar, T. S. Selvavinayagam, C. Padmapriyadarsini, Ranjani Ramachandran, Manoj V. Murhekar