Contact tracing has been initiated with direct communication to anyone determined to have been a close contact with a positive individual.

http://mcook.instructure.com/eportfolios/37596/Tren_Tabs_Dt_Ho_Chi_Minh__AlphaPharma__Oral_Steroids
http://csupalliativecare.instructure.com/eportfolios/30967/Slim_Trim_Threshold_Curtains__German_Remedies__Weight_Loss

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Consider if there are some obvious ways to group your customers based on different characteristics.