function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Burckhardt, Daniel & Ouvrard, David', 1],
    ['Burckhardt, Daniel & Ouvrard, David & Percy, Diana M.', 3],
    ['Burckhardt, Daniel & Queiroz, Dalva Luiz De', 3],
    ['Burckhardt, Daniel & Sharma, Anamika & Raman, Anantanarayanan', 3],
    ['Cadwell, J. S.', 2],
    ['Cho, Geonho & Burckhardt, Daniel & Lee, Seunghwan', 1],
    ['Cho, Geonho & Inoue, Hiromitsu & Burckhardt, Daniel', 1],
    ['Froggatt, Walter Wilson', 2],
    ['Halbert, Susan E. & Burckhardt, Daniel', 3],
    ['Martin, Jon H. & Lau, Clive S. K.', 1],
    ['Martoni, Francesco & Brown, Samuel D. J.', 1],
    ['Martoni, Francesco & Burckhardt, Daniel & Armstrong, Karen', 1],
    ['Rendón-Mera, Diana Isabel & Serna, Francisco', 1],
    ['Xian, Chunlan & Leong, Chi Man & Luo, Jiuyang & Jia, Fenglong', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=24)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);