Synergistic associations of ambient air pollution and heat on daily mortality in India by Jeroen de Bont, Ajit Rajiva, Siddhartha Mandal, Massimo Stafoggia, Tirthankar Banerjee, Hem Dholakia, Amit Garg, Vijendra Ingole, Suganthi Jaganathan, Itai Kloog, Bhargav Krishna, Kevin Lane, R.K. Mall, Jyothi Menon, Amruta Nori-Sarma, Dorairaj Prabhakaran, Abhiyant Suresh Tiwari, Yaguang Wei, Gregory A. Wellenius, Joel Schwartz, Poornima Prabhakaran, Petter Ljungman