A survey is conducted on a simple random sample of 1,000 women in CA in 2017 who recently gave birth, asking them about whether or not they smoked during pregnancy. A follow-up survey asking if the children have respiratory problems is conducted 3 years later. However, only 467 of these women are reached at the same address. The researcher reports that these 467 women are representative of all mothers. Identify the flaw(s) in reasoning in this scenario, and where systematic bias is likely sneaking in (1 - 3 sentences).