Effect of gutkha chewing on periodontal health and oral hygiene of peoples in Delhi NCR region of North India: A cross-sectional multicentered study. - Verma, Santosh; Kumar, Barun; Singh, Swati; Kumari, Puja; Agarwal, Anurag; Singh, Tarun; Passi, Deepak; Goyal, Jyoti (Journal of Family Medicine & Primary Care, 2019)