function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aibara, M. & Takahashi, T. & Nakaya, Kazuhiro', 1],
    ['Büscher, H. H.', 3],
    ['Kullander, Sven O. & Norén, Michael Dr. & Karlsson, Mikael', 1],
    ['Nakaya, Kazuhiro & Gashagaza, M. M.', 1],
    ['Piet Verburg & Roger Bills', 15],
    ['Robert Schelly & Melanie L. J. Stiassny & Lothar Seegers', 1],
    ['Verburg, Piet & Bills, Roger', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=25)',
    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);