function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Huemer, Peter & Van Nieukerken, Erik J.', 1],
    ['Kaila, Lauri & Mutanen, Marko & Sihvonen, Pasi & Tyllinen, Juha', 7],
    ['Knyazev, S. A. & Ivonin, V. V. & Ustjuzhanin, P. Ya.', 1],
    ['Tabell, Jukka & Mutanen, Marko & Sihvonen, Pasi', 3],
    ['Tabell, Jukka & Wikström, Bo & Mutanen, Marko & Bruckner, Harald', 16]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=28)',
    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);