About Cessation Data Collection Economics Epidemiology Second Hand Smoke Youth PowerPoint Presentations Other Add a resource Determinants of Salivary Cotinine Levels - A Study from Mumbai, India (Protocol) A protocol from a collaborative project between the Johns Hopkins Bloomberg School of Public Health and Tata Memorial Centre to assess distribution of salivary cotinine levels among smokers in India. Power from Data! Data Collection Methods (Toolkit) This section of Statistics Canada’s toolkit, Statistics: Power from Data! offers explanations on different types of data collection methods, including personal interviews, self completed interviews, and other methods.