function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barreto, Mauricio & Burbano, María E. & Proctor, Heather C.', 4],
    ['Eren, Gökhan & Öztürk, Mehmet & Mironov, Sergey V.', 2],
    ['HALLIDAY, R. B.', 20],
    ['Han, Yeong-Deok & Mironov, Sergey V. & Kim, Jeong-Hoon', 3],
    ['Negm, Mohamed W. & Nasser, D. & Alatawi, Fahad J.', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=34)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 5, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);