function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ahmadi, Marzieh & Esfandiari, Mehdi & Muilwijk, Jan', 2],
    ['Azadbakhsh, Saeed & Nozari, Jamasb', 1],
    ['Bulirsch, Petr', 11],
    ['Bulirsch, Petr & Stachowiak, Mieczyslaw', 11],
    ['Merene, Yeshitla & Lorenz, Wolfgang & Opgenoorth, Lars', 1],
    ['Teofilova, Teodora', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    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);