function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Berlese, Antonio', 2],
    ['Ermilov, Sergey G. & Corpuz-Raros, Leonila', 1],
    ['Ermilov, Sergey G. & Liao, Jhih-Rong', 1],
    ['Murvanidze, Maka & Mumladze, Levan', 1],
    ['Tang, Jin & Zhang, Gongaote & Guo, Junqi & Luo, Lingxuan', 1],
    ['Zheng, Li-Hao & Chen, Jun', 9],
    ['Zheng, Lihao & Chen, Jun', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    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);