“…Studies varied in sample size 39 , 42 (27–52,643) as well as age 33 , 42 (59.3–76 years). In six studies, 32 – 34 , 36 , 37 , 40 data on age and/or sex could not be extracted, and in five, 33 , 36 , 40 – 42 data on obesity was unavailable. Seven studies 31 , 33 , 34 , 36 , 39 , 41 , 42 out of 14 reported data on smoking status among their sample.…”