Unfortunately, there is not one unique database that shows all cited references for all articles. Each database is limited by 1) which journals it indexes and 2) date limits of journals indexed. So, searching for the number of citations to a particular article will yield different results in different databases.
Deng MC, Effect of receiving a heart transplant: analysis of a national cohort entered on to a waiting list, stratified by heart failure severity. BMJ. 2000 Sep 2;321(7260):540-5.
In addition, indexing practices differ between databases so variants in author names and journal titles become a problem:
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