function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Castello-Branco, Cristiana & Hajdu, Eduardo', 2],
    ['Díaz-Agras, Guillermo', 5],
    ['Ekins, Merrick & Baker, Soraya & Hooper, John N. A.', 7],
    ['Hajdu, Eduardo & Castello-Branco, Cristiana', 2],
    ['Hajdu, Eduardo & Hooker, Yuri & Willenz, Philippe', 3],
    ['Ise, Yuji & Woo, Sau Pinn & Tan, Shau Hwai & Fujita, Toshihiko', 3],
    ['Van, Rob W. M.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=23)',
    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);