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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( (practical OR practice) guidebook to (((biostatistical OR biostatistics) OR (biostatistical OR biostatistics)) OR (biostatistical OR biostatistics)) AND epidemiology. ) OR ( (practical OR practice) guide to (statistics OR statistical) AND epidemiology. ))~".
• Adding a wildcard symbol may retrieve word variants: (( (practical OR practice) guidebook to (((biostatistical OR biostatistics) OR (biostatistical OR biostatistics)) OR (biostatistical OR biostatistics)) AND epidemiology. ) OR ( (practical OR practice) guide to (statistics OR statistical) AND epidemiology. ))*.