function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aristov, D. S.', 6],
    ['Guan, Zhaoying & Prokop, Jakub & Roques, Patrick', 4],
    ['Liu, Yushuang & Ren, Dong & Prokop, Jakub', 2],
    ['Martins-Neto, R. G. & Gallego, O. F. & Brauckmann, C.', 2],
    ['Nel, Andre & Garrouste, Romain & Prokop, Jakub', 4],
    ['Nel, Andre & Roques, Patrick & Duquesne, Herve', 1],
    ['Shcherbakov, Dmitry E.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);