function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Baixeras, Joaquín & Karsholt, Ole', 2],
    ['Das, Gaurab Nandi & Singh, Navneet & Brown, John W.', 1],
    ['Groenen, Frans & Wangdi, Karma', 1],
    ['Pathania, Prakash C. & Das, Apurva & Chandra, Kailash', 11],
    ['Razowski, Józef & Aarvik, Leif & Prins, Jurate De', 3],
    ['Wieser, Christian', 1],
    ['Wojtusiak, Janusz & Razowski, Józef', 1],
    ['Zlatkov, Boyan & Huemer, Peter', 8]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=28)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);