function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bagnall, Richard Siddoway', 1],
    ['Camacho, Miguel Domínguez', 7],
    ['Camacho, Miguel Domínguez & Vandenspiegel, Didier', 14],
    ['Jin, Ya-Li & Bu, Yun', 12],
    ['Jin, Ya-Li & Bu, Yun & Jiang, Yue', 3],
    ['Jin, Ya-Li & Nunes Godeiro, Nerivania & Bu, Yun', 2],
    ['Newport,?', 1],
    ['Parra-Gomez, Antonio & Perez-Schultheiss, Jorge', 1],
    ['Perez-Gelabert, Daniel E.', 1],
    ['Pugh, P. J. A.', 3],
    ['Scheller, Ulf', 1],
    ['Scheller, Ulf & Kavianpour, Mohammad Reza & Esfandiari, Mehdi', 2],
    ['Wesener, Thomas & Moritz, Leif', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=50)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);