9) A case-control study was conducted to determine if using any antihistamines around the time of conception increased the risk of birth defects in the offspring. No personal interviews were conducted regarding the subjects' antihistamine use. Instead, women were considered exposed if computerized pharmacy records from their health maintenance organization indicated that they had filled at least one prescription for antihistamines within 500 days before the birth of the child. a. Which type of observation bias is this data collection method most susceptible to? Also state whether it's differential or non-differential? SP b. Which type of observation bias is this data collection method least susceptible to in terms of exposure assessment? SEP