function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Dale-Skey, Natalie & Askew, Richard R. & Noyes, John S.', 10],
    ['Haas, Michael & Baur, Hannes & Schweizer, Tanja', 1],
    ['Jiao, Tian-yang & Yao, Qin-ying & Xiao, Hui', 15],
    ['Madl, Michael', 1],
    ['Mifsud, David & Askew, Richard R.', 1],
    ['Peters, Ralph S. & Baur, Hannes', 3],
    ['Plecas, Milan & Zikic, Vladimir & Kocic, Korana', 1],
    ['Pérez-Benavides, A. Lucía & Hernández-Baz, Fernando', 1],
    ['Tselikh, E. V.', 2],
    ['Tselikh, E. V. & Lee, J. & Ku, D. - S.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=36)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);