function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Averyanov, Leonid V. & Thai, Tran Huy & Nguyen, Van Canh', 1],
    ['Averyanov, Leonid V. & Thai, Tran Huy & Truong, Ba Vuong', 1],
    ['Bandara, Champika & Atthanagoda, Anusha Gayan', 3],
    ['Kocyan, Alexander & Schuiteman, André', 2],
    ['Ormerod, Paul & Kurzweil, Hubert & Watthana, Santi', 5],
    ['Schlechter, Fridrich Richard Rudolf', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    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);