***TASK*** the task is to summarize an input biomedical literature in six sentences 
    ***INPUT*** the input is a biomedical literature 
    ***OUTPUT*** the output is the summary of an input biomedical literature in six sentences 
    ***DOCUMENTATION*** 
    ***EXAMPLES*** 
    Input: BACKGROUND Thimerosal is an organic-mercury (Hg)-containing compound ( 49.55 % Hg by weight ) historically added to many multi-dose vials of vaccine as a preservative and still added to some vaccines today . Concerns about the toxic effects from Thimerosal-containing childhood vaccines and the risk of an atypical autism diagnosis were evaluated in this study . METHODS A hypothesis-testing , prospect i ve longitudinal , case-control study assessed exposure to Hg from Thimerosal-containing hepatitis B vaccines ( TM-HepB ) among cases diagnosed with atypical autism ( n=164 ) and controls ( n=15,216 ) . Automated medical records for subjects born from 1991 to 2000 and continuously enrolled in the Vaccine Safety Data link ( VSD ) data base were examined . RESULTS Cases diagnosed with atypical autism were statistically significantly more likely to have received greater overall and dose-dependent exposures to Hg from  TM-HepB vaccines administered within the first month of life , first two months of life , and first six months of life than the controls . Similar phenomena were observed when cases and controls were separated by gender . CONCLUSIONS Routine childhood vaccination is an important public health tool to reduce infectious diseases . The present study provides important epidemiological evidence significantly associating increasing Hg exposure from Thimerosal-containing childhood vaccines and the subsequent risk of atypical autism diagnosis , and suggests that Thimerosal should be eliminated from vaccines 
    Output:
    
Results of the current meta- analysis revealed that mercury is an important causal factor in the etiology of ASD .
It seems that the detoxification and excretory mechanisms are impaired in ASD patients which lead to accumulation of mercury in the body .