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

This survey has some limitations, namely: the intrinsic limits of the study design itself, the poor data obtained in the study population with respect to specific conditions and behaviors (i.e., obesity, alcohol consumption, or smoking habits) that are considered variables involved in the decrease of the immunogenicity of HBV vaccine over time,25 and the fact that not all the HCSs were compliant with the procedures of the study protocol and were consequently discharged. 
user
This is no advice
assistant