function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Akyol, Mustafa & Koç, Kamil', 4],
    ['Bolland, Hans R.', 1],
    ['Canestrini, Giovanni', 1],
    ['Doġan, Salih', 21],
    ['Fan, Qing-Hai & Walter, David E.', 22],
    ['Fan, Qing-Hai & Zhang, Zhi-Qiang', 1],
    ['Khanjani, Mohammad & Fayaz, Bahman Asali', 4],
    ['Khanjani, Mohammad & Hoseini, Mohammad Ahmad', 9],
    ['Khanjani, Mohammad & Yazyanpanah, Shima & Ostovan, Hadi', 4],
    ['LIU, DONG & YI, TIAN-CI & XU, YUN & ZHANG, ZHI-QIANG', 7],
    ['Meyer, Magdalena K. P.', 1],
    ['Paredes-León, Ricardo & Corona-López, Angélica María', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=79)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);