function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bian, Dongju & Guo, Cheng & Ji, Lanzhu', 1],
    ['Bian, Dongju & Ji, Lanzhu', 10],
    ['Bian, Dongju & Zhang, Yue & Ji, Lanzhu', 2],
    ['Ji, Lanzhu & Guo, Cheng & Bian, Dongju', 1],
    ['Nilsson, Anders N.', 5],
    ['Suprayitno, Nano & Narakusumo, Raden Pramesa', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=21)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);