function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Haase, Martin & Rintelen, Thomas von & Harting, Britta', 5],
    ['Haase, Martin & Zielske, Susan', 7],
    ['Pugh, Philip J. A. & Scott, Bronwen', 1],
    ['Salvador, Rodrigo B. & Silva, Fernanda S. & Cavallari, Daniel C.', 2],
    ['Verhaegen, Gerlien & Haase, Martin', 1],
    ['Wesselingh, Frank & Poorten, Jan Johan ter & Kijashko, Pavel', 1],
    ['Zhang, - H.', 12]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=29)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);