function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chatterjee, Tapas & Dovgal, Igor & Mayén-Estrada, Rosaura', 6],
    ['Chаtterjee, Tаpаs & Dovgаl, Igor & Pešić, Vlаdimir', 3],
    ['Clamp, John C. & Kane, John R.', 7],
    ['Mayén-Estrada, Rosaura & Clamp, John C.', 20],
    ['Mayén-Estrada, Rosaura & Dávila, Sthefane', 1],
    ['Stloukal, Eduard & Matis, Dušan', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=38)',
    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);