def ecitmatch(**keywds):
 cgi = 'https://eutils.ncbi.nlm.nih.gov/entrez/eutils/ecitmatch.cgi'
 variables = _update_ecitmatch_variables(keywds)
 return _open(cgi, variables, ecitmatch=True)

def ecitmatch ( ** keywds ) : cgi = 'https://eutils.ncbi.nlm.nih.gov/entrez/eutils/ecitmatch.cgi' variables = _update_ecitmatch_variables ( keywds ) return _open ( cgi , variables , ecitmatch = True )
ecitmatch retrieves pmids-citation linking ecitmatch retrieves pubmed ids that correspond to a set of input citation strings .