function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Gupta, Sunil Kumar & Chandra, Kailash', 12],
    ['Hristov, Georgi H. & Chobanov, Dragan P.', 1],
    ['Iglesias, Monica Sandra', 1],
    ['Jin, Duting & Zhao, Qiongyao & Han, Wei & Li, Jinxiang', 3],
    ['Lu, Wenhua & Valentine, Barry D. & Perez-Gelabert, Daniel E.', 1],
    ['Pellens, Roseli & Grandcolas, Philippe', 1],
    ['Swezey, O. H.', 1],
    ['VIDLIČKA, ĽUBOMÍR', 1],
    ['Xian, Chunlan & Leong, Chi Man & Luo, Jiuyang & Jia, Fenglong', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=22)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);