function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Englmaier, Gernot K. & Tesfaye, Genanaw & Bogutskaya, Nina G.', 1],
    ['Ginneken, Marjolein Van & Decru, Eva & Verheyen, Erik', 1],
    ['Maetens, Heleen & Steenberge, Maarten Van & Snoeks, Jos', 3],
    ['Mamonekene, Victor & Zamba, Armel Ibala', 1],
    ['Martin, Melissa B. & Chakona, Albert', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=7)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 5, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);