code: def make_pubmed_abstract_group(pmids: Iterable[Union[str, int]]) -> Iterable[str]:
      
      for pmid in set(pmids):
          yield ''
  
          res = requests.get(title_url_fmt.format(pmid))
          title = res.content.decode('utf-8').strip()
  
          yield 'SET Citation = {{"{}", "{}"}}'.format(title, pmid)
  
          res = requests.get(abstract_url_fmt.format(pmid))
          abstract = res.content.decode('utf-8').strip()
  
          yield 'SET Evidence = "{}"'.format(abstract)
          yield '\nUNSET Evidence\nUNSET Citation'
docs: Build a skeleton for the citations' statements.
      
      :param pmids: A list of PubMed identifiers
      :return: An iterator over the lines of the citation section