function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Balke, M. & Hendrich, L. & Mazzoldi, P. & Biström, O.', 11],
    ['Hájek, Jiří', 2],
    ['Peng, Yunfei & Ji, Lanzhu & Bian, Dongju & Hájek, Jiří', 1],
    ['Ramahandrison, Andriamirado Tahina & Rakouth, Bakolimalala', 1],
    ['Zhao, Shuang & Hájek, Jiří & Jia, Fenglong & Pang, Hong', 7]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=22)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 5, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);