Question: is this a 2) strong advice, 1) weak advice 0) no advice?

Moreover, the long latent period prior to diagnosis can result in misclassification of controls who may later develop dementia [Elias et al  2000; Snowdon et al  1997; Sperling et al  2011], and lead to survivor bias where individuals who would have been classified as cases have died from other causes. 
user
This is no advice
assistant