function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acosta, Roxana', 2],
    ['Acosta, Roxana & Morrone, Juan J.', 2],
    ['Beatriz & Salceda-Sánchez & Hastriter, Michael W.', 1],
    ['Keskin, Adem & Hastriter, Michael W. & Beaucournu, Jean-Claude', 3],
    ['Kitrytė, Neringa & Baltrūnaitė, Laima', 3],
    ['Kutzscher, Christian & Weber, Dieter', 1],
    ['Lin, Jian-Zhen', 1],
    ['Morrone, Juan J. & Acosta, Roxana', 6],
    ['Reeves, Will K. & Durden, Lance A. & Ritzi, Christopher M.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);