code: function findPubMedArticle(title, callback) {
    var uri = 'http://www.ncbi.nlm.nih.gov/pubmed/?term=' + title.replace(/ /g, '+');
    utils.retrieve(uri, function(err, contents) {
       var $ = cheerio.load(contents);
       var absid = $('#absid');
       if (absid) {
         var id = $(absid).val();
         callback(null, id, 'http://www.ncbi.nlm.nih.gov/pubmed/' + id);
       } else {
         callback(null, null);
       }
  
    });
  }
docs: /*findPubMedArticle('Lexical patterns, features and knowledge resources for coreference resolution in clinical notes.', function(err, res) {
  console.log(err, res);
  });