function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Guerra-García, José M.', 2],
    ['Mauro, Fábio Da Motta & Serejo, Cristiana Silveira', 2],
    ['Momtazi, Farzaneh & Sari, Alireza', 2],
    ['Stebbing, Thomas R. R.', 1],
    ['Takeuchi, Ichiro & Lowry, James K.', 5],
    ['Zeina, Amr F. & Guerra, José M.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);