function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Liu, Sheng-fa & Yang, Tingbao', 1],
    ['Looss, A.', 1],
    ['Machida, Masaaki', 3],
    ['Rekharani, Z. & Madhavi, R.', 2],
    ['Vlasenko, P. V.', 1],
    ['Zhao, Heng & Vlasak, Josef & Yuan, Yuan', 2],
    ['Zhou, Meng & Wang, Li & May, Tom W. & Vlasak, Josef', 7]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=17)',
    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);